diff --git a/autotests/localfilelistingtest.cpp b/autotests/localfilelistingtest.cpp
--- a/autotests/localfilelistingtest.cpp
+++ b/autotests/localfilelistingtest.cpp
@@ -292,9 +292,9 @@
         }
         QCOMPARE(errorWatchingFilesSpy.count(), 0);
 
-        auto firstNewTracksSignal = tracksListSpy.at(0);
+        const auto &firstNewTracksSignal = tracksListSpy.at(0);
         auto firstNewTracks = firstNewTracksSignal.at(0).value<QList<MusicAudioTrack>>();
-        auto secondNewTracksSignal = tracksListSpy.at(1);
+        const auto &secondNewTracksSignal = tracksListSpy.at(1);
         auto secondNewTracks = secondNewTracksSignal.at(0).value<QList<MusicAudioTrack>>();
         auto newCovers = secondNewTracksSignal.at(1).value<QHash<QString, QUrl>>();
 
diff --git a/src/musicalbum.h b/src/musicalbum.h
--- a/src/musicalbum.h
+++ b/src/musicalbum.h
@@ -27,6 +27,7 @@
 #include <QMap>
 #include <QStringList>
 #include <QMetaType>
+#include <QSharedDataPointer>
 
 #include <memory>
 
@@ -40,11 +41,11 @@
 
     MusicAlbum();
 
-    MusicAlbum(MusicAlbum &&other);
+    MusicAlbum(MusicAlbum &&other) noexcept;
 
     MusicAlbum(const MusicAlbum &other);
 
-    MusicAlbum& operator=(MusicAlbum &&other);
+    MusicAlbum& operator=(MusicAlbum &&other) noexcept;
 
     MusicAlbum& operator=(const MusicAlbum &other);
 
@@ -126,14 +127,16 @@
 
 private:
 
-    std::unique_ptr<MusicAlbumPrivate> d;
+    QSharedDataPointer<MusicAlbumPrivate> d;
 
 };
 
 ELISALIB_EXPORT QDebug operator<<(QDebug stream, const MusicAlbum &data);
 
 ELISALIB_EXPORT bool operator==(const MusicAlbum &album1, const MusicAlbum &album2);
 
+Q_DECLARE_TYPEINFO(MusicAlbum, Q_MOVABLE_TYPE);
+
 Q_DECLARE_METATYPE(MusicAlbum)
 
 #endif // MUSICALBUM_H
diff --git a/src/musicalbum.cpp b/src/musicalbum.cpp
--- a/src/musicalbum.cpp
+++ b/src/musicalbum.cpp
@@ -23,10 +23,11 @@
 #include <QString>
 #include <QUrl>
 #include <QMap>
+#include <QSharedData>
 
 #include <QDebug>
 
-class MusicAlbumPrivate
+class MusicAlbumPrivate : public QSharedData
 {
 public:
 
@@ -48,47 +49,27 @@
 
     QList<MusicAudioTrack> mTracks;
 
+    QStringList mGenres;
+
     int mTracksCount = 0;
 
     bool mIsValid = false;
 
     bool mIsSingleDiscAlbum = true;
 
-    QStringList mGenres;
-
 };
 
-MusicAlbum::MusicAlbum() : d(std::make_unique<MusicAlbumPrivate>())
-{
-}
-
-MusicAlbum::MusicAlbum(MusicAlbum &&other)
-{
-    d.swap(other.d);
-}
-
-MusicAlbum::MusicAlbum(const MusicAlbum &other) : d(std::make_unique<MusicAlbumPrivate>(*other.d))
+MusicAlbum::MusicAlbum() : d(new MusicAlbumPrivate())
 {
 }
 
-MusicAlbum& MusicAlbum::operator=(MusicAlbum &&other)
-{
-    if (&other != this) {
-        d.reset();
-        d.swap(other.d);
-    }
+MusicAlbum::MusicAlbum(MusicAlbum &&other) noexcept = default;
 
-    return *this;
-}
+MusicAlbum::MusicAlbum(const MusicAlbum &other) = default;
 
-MusicAlbum& MusicAlbum::operator=(const MusicAlbum &other)
-{
-    if (&other != this) {
-        (*d) = (*other.d);
-    }
+MusicAlbum& MusicAlbum::operator=(MusicAlbum &&other) noexcept = default;
 
-    return *this;
-}
+MusicAlbum& MusicAlbum::operator=(const MusicAlbum &other) = default;
 
 MusicAlbum::~MusicAlbum()
 = default;
diff --git a/src/musicartist.h b/src/musicartist.h
--- a/src/musicartist.h
+++ b/src/musicartist.h
@@ -22,6 +22,7 @@
 
 #include <QString>
 #include <QMetaType>
+#include <QSharedDataPointer>
 
 #include <memory>
 
@@ -34,11 +35,11 @@
 
     MusicArtist();
 
-    MusicArtist(MusicArtist &&other);
+    MusicArtist(MusicArtist &&other) noexcept;
 
     MusicArtist(const MusicArtist &other);
 
-    MusicArtist& operator=(MusicArtist &&other);
+    MusicArtist& operator=(MusicArtist &&other) noexcept;
 
     MusicArtist& operator=(const MusicArtist &other);
 
@@ -66,14 +67,16 @@
 
 private:
 
-    std::unique_ptr<MusicArtistPrivate> d;
+    QSharedDataPointer<MusicArtistPrivate> d;
 
 };
 
 QDebug& operator<<(QDebug &stream, const MusicArtist &data);
 
 bool operator==(const MusicArtist &artist1, const MusicArtist &artist2);
 
+Q_DECLARE_TYPEINFO(MusicArtist, Q_MOVABLE_TYPE);
+
 Q_DECLARE_METATYPE(MusicArtist)
 
 #endif // MUSICARTIST_H
diff --git a/src/musicartist.cpp b/src/musicartist.cpp
--- a/src/musicartist.cpp
+++ b/src/musicartist.cpp
@@ -20,9 +20,11 @@
 #include <QtGlobal>
 #include <QString>
 #include <QStringList>
+#include <QSharedData>
+
 #include <QDebug>
 
-class MusicArtistPrivate
+class MusicArtistPrivate : public QSharedData
 {
 public:
 
@@ -38,37 +40,17 @@
 
 };
 
-MusicArtist::MusicArtist() : d(std::make_unique<MusicArtistPrivate>())
+MusicArtist::MusicArtist() : d(new MusicArtistPrivate())
 {
 }
 
-MusicArtist::MusicArtist(MusicArtist &&other)
-{
-    d.swap(other.d);
-}
+MusicArtist::MusicArtist(MusicArtist &&other) noexcept = default;
 
-MusicArtist::MusicArtist(const MusicArtist &other) : d(std::make_unique<MusicArtistPrivate>(*other.d))
-{
-}
+MusicArtist::MusicArtist(const MusicArtist &other) = default;
 
-MusicArtist& MusicArtist::operator=(MusicArtist &&other)
-{
-    if (&other != this) {
-        d.reset();
-        d.swap(other.d);
-    }
+MusicArtist& MusicArtist::operator=(MusicArtist &&other) noexcept = default;
 
-    return *this;
-}
-
-MusicArtist &MusicArtist::operator=(const MusicArtist &other)
-{
-    if (&other != this) {
-        (*d) = (*other.d);
-    }
-
-    return *this;
-}
+MusicArtist &MusicArtist::operator=(const MusicArtist &other) = default;
 
 MusicArtist::~MusicArtist()
 = default;
diff --git a/src/musicaudiogenre.h b/src/musicaudiogenre.h
--- a/src/musicaudiogenre.h
+++ b/src/musicaudiogenre.h
@@ -22,6 +22,7 @@
 
 #include <QString>
 #include <QMetaType>
+#include <QSharedDataPointer>
 
 #include <memory>
 
@@ -35,11 +36,11 @@
 
     MusicAudioGenre();
 
-    MusicAudioGenre(MusicAudioGenre &&other);
+    MusicAudioGenre(MusicAudioGenre &&other) noexcept;
 
     MusicAudioGenre(const MusicAudioGenre &other);
 
-    MusicAudioGenre& operator=(MusicAudioGenre &&other);
+    MusicAudioGenre& operator=(MusicAudioGenre &&other) noexcept;
 
     MusicAudioGenre& operator=(const MusicAudioGenre &other);
 
@@ -55,14 +56,16 @@
 
 private:
 
-    std::unique_ptr<MusicAudioGenrePrivate> d;
+    QSharedDataPointer<MusicAudioGenrePrivate> d;
 
 };
 
 QDebug& operator<<(QDebug &stream, const MusicAudioGenre &data);
 
 bool operator==(const MusicAudioGenre &genre1, const MusicAudioGenre &genre2);
 
+Q_DECLARE_TYPEINFO(MusicAudioGenre, Q_MOVABLE_TYPE);
+
 Q_DECLARE_METATYPE(MusicAudioGenre)
 
 #endif // MUSICAUDIOGENRE_H
diff --git a/src/musicaudiogenre.cpp b/src/musicaudiogenre.cpp
--- a/src/musicaudiogenre.cpp
+++ b/src/musicaudiogenre.cpp
@@ -17,9 +17,11 @@
 
 #include "musicaudiogenre.h"
 
+#include <QSharedData>
+
 #include <QDebug>
 
-class MusicAudioGenrePrivate
+class MusicAudioGenrePrivate : public QSharedData
 {
 public:
 
@@ -29,37 +31,17 @@
 
 };
 
-MusicAudioGenre::MusicAudioGenre() : d(std::make_unique<MusicAudioGenrePrivate>())
+MusicAudioGenre::MusicAudioGenre() : d(new MusicAudioGenrePrivate())
 {
 }
 
-MusicAudioGenre::MusicAudioGenre(MusicAudioGenre &&other)
-{
-    d.swap(other.d);
-}
+MusicAudioGenre::MusicAudioGenre(MusicAudioGenre &&other) noexcept = default;
 
-MusicAudioGenre::MusicAudioGenre(const MusicAudioGenre &other) : d(std::make_unique<MusicAudioGenrePrivate>(*other.d))
-{
-}
+MusicAudioGenre::MusicAudioGenre(const MusicAudioGenre &other) = default;
 
-MusicAudioGenre& MusicAudioGenre::operator=(MusicAudioGenre &&other)
-{
-    if (&other != this) {
-        d.reset();
-        d.swap(other.d);
-    }
+MusicAudioGenre& MusicAudioGenre::operator=(MusicAudioGenre &&other) noexcept = default;
 
-    return *this;
-}
-
-MusicAudioGenre &MusicAudioGenre::operator=(const MusicAudioGenre &other)
-{
-    if (&other != this) {
-        (*d) = (*other.d);
-    }
-
-    return *this;
-}
+MusicAudioGenre &MusicAudioGenre::operator=(const MusicAudioGenre &other) = default;
 
 MusicAudioGenre::~MusicAudioGenre()
 = default;
diff --git a/src/musicaudiotrack.h b/src/musicaudiotrack.h
--- a/src/musicaudiotrack.h
+++ b/src/musicaudiotrack.h
@@ -24,6 +24,7 @@
 #include <QTime>
 #include <QUrl>
 #include <QMetaType>
+#include <QSharedDataPointer>
 
 #include <memory>
 
@@ -70,49 +71,49 @@
 
     qulonglong albumId() const;
 
-    void setId(const QString &value) const;
+    void setId(const QString &value);
 
     QString id() const;
 
-    void setParentId(const QString &value) const;
+    void setParentId(const QString &value);
 
     QString parentId() const;
 
-    void setTitle(const QString &value) const;
+    void setTitle(const QString &value);
 
     QString title() const;
 
-    void setArtist(const QString &value) const;
+    void setArtist(const QString &value);
 
     QString artist() const;
 
-    void setAlbumName(const QString &value) const;
+    void setAlbumName(const QString &value);
 
     QString albumName() const;
 
-    void setAlbumArtist(const QString &value) const;
+    void setAlbumArtist(const QString &value);
 
     QString albumArtist() const;
 
-    void setGenre(const QString &value) const;
+    void setGenre(const QString &value);
 
     QString genre() const;
 
-    void setComposer(const QString &value) const;
+    void setComposer(const QString &value);
 
     QString composer() const;
 
-    void setLyricist(const QString &value) const;
+    void setLyricist(const QString &value);
 
     QString lyricist() const;
 
-    void setComment(const QString &value) const;
+    void setComment(const QString &value);
 
     QString comment() const;
 
     bool isValidAlbumArtist() const;
 
-    void setAlbumCover(const QUrl &value) const;
+    void setAlbumCover(const QUrl &value);
 
     QUrl albumCover() const;
 
@@ -152,7 +153,7 @@
 
     const QUrl& resourceURI() const;
 
-    void setRating(int value) const;
+    void setRating(int value);
 
     int rating() const;
 
@@ -162,12 +163,14 @@
 
 private:
 
-    std::unique_ptr<MusicAudioTrackPrivate> d;
+    QSharedDataPointer<MusicAudioTrackPrivate> d;
 
 };
 
 ELISALIB_EXPORT QDebug operator<<(QDebug stream, const MusicAudioTrack &data);
 
+Q_DECLARE_TYPEINFO(MusicAudioTrack, Q_MOVABLE_TYPE);
+
 Q_DECLARE_METATYPE(MusicAudioTrack)
 
 #endif // MUSICAUDIOTRACK_H
diff --git a/src/musicaudiotrack.cpp b/src/musicaudiotrack.cpp
--- a/src/musicaudiotrack.cpp
+++ b/src/musicaudiotrack.cpp
@@ -20,8 +20,9 @@
 #include <QDateTime>
 #include <QDebug>
 #include <utility>
+#include <QSharedData>
 
-class MusicAudioTrackPrivate
+class MusicAudioTrackPrivate : public QSharedData
 {
 public:
 
@@ -33,7 +34,8 @@
                            QDateTime fileModificationTime, QUrl aAlbumCover, int rating,
                            bool aIsSingleDiscAlbum, QString aGenre, QString aComposer,
                            QString aLyricist)
-        : mId(std::move(aId)), mParentId(std::move(aParentId)), mTitle(std::move(aTitle)), mArtist(std::move(aArtist)),
+        : QSharedData(), mId(std::move(aId)), mParentId(std::move(aParentId)),
+          mTitle(std::move(aTitle)), mArtist(std::move(aArtist)),
           mAlbumName(std::move(aAlbumName)), mAlbumArtist(std::move(aAlbumArtist)),
           mGenre(std::move(aGenre)), mComposer(std::move(aComposer)), mLyricist(std::move(aLyricist)),
           mResourceURI(std::move(aResourceURI)),
@@ -96,55 +98,35 @@
 
 };
 
-MusicAudioTrack::MusicAudioTrack() : d(std::make_unique<MusicAudioTrackPrivate>())
+MusicAudioTrack::MusicAudioTrack() : d(new MusicAudioTrackPrivate())
 {
 }
 
 MusicAudioTrack::MusicAudioTrack(bool aValid, QString aId, QString aParentId, QString aTitle, QString aArtist, QString aAlbumName,
                                  QString aAlbumArtist, int aTrackNumber, int aDiscNumber, QTime aDuration, QUrl aResourceURI,
                                  const QDateTime &fileModificationTime, QUrl aAlbumCover, int rating, bool aIsSingleDiscAlbum,
                                  QString aGenre, QString aComposer, QString aLyricist)
-    : d(std::make_unique<MusicAudioTrackPrivate>(aValid, std::move(aId), std::move(aParentId),
-                                                 std::move(aTitle), std::move(aArtist),
-                                                 std::move(aAlbumName), std::move(aAlbumArtist),
-                                                 aTrackNumber, aDiscNumber, aDuration,
-                                                 std::move(aResourceURI), fileModificationTime,
-                                                 std::move(aAlbumCover), rating,
-                                                 aIsSingleDiscAlbum, std::move(aGenre),
-                                                 std::move(aComposer), std::move(aLyricist)))
+    : d(new MusicAudioTrackPrivate(aValid, std::move(aId), std::move(aParentId),
+                                   std::move(aTitle), std::move(aArtist),
+                                   std::move(aAlbumName), std::move(aAlbumArtist),
+                                   aTrackNumber, aDiscNumber, aDuration,
+                                   std::move(aResourceURI), fileModificationTime,
+                                   std::move(aAlbumCover), rating,
+                                   aIsSingleDiscAlbum, std::move(aGenre),
+                                   std::move(aComposer), std::move(aLyricist)))
 {
 }
 
-MusicAudioTrack::MusicAudioTrack(MusicAudioTrack &&other) noexcept
-{
-    d.swap(other.d);
-}
+MusicAudioTrack::MusicAudioTrack(MusicAudioTrack &&other) noexcept = default;
 
-MusicAudioTrack::MusicAudioTrack(const MusicAudioTrack &other) : d(std::make_unique<MusicAudioTrackPrivate>(*other.d))
-{
-}
+MusicAudioTrack::MusicAudioTrack(const MusicAudioTrack &other) = default;
 
 MusicAudioTrack::~MusicAudioTrack()
 = default;
 
-MusicAudioTrack& MusicAudioTrack::operator=(MusicAudioTrack &&other) noexcept
-{
-    if (this != &other) {
-        d.reset();
-        d.swap(other.d);
-    }
-
-    return *this;
-}
-
-MusicAudioTrack& MusicAudioTrack::operator=(const MusicAudioTrack &other)
-{
-    if (this != &other) {
-        (*d) = (*other.d);
-    }
+MusicAudioTrack& MusicAudioTrack::operator=(MusicAudioTrack &&other) noexcept = default;
 
-    return *this;
-}
+MusicAudioTrack& MusicAudioTrack::operator=(const MusicAudioTrack &other) = default;
 
 bool MusicAudioTrack::operator <(const MusicAudioTrack &other) const
 {
@@ -211,7 +193,7 @@
     return d->mAlbumId;
 }
 
-void MusicAudioTrack::setId(const QString &value) const
+void MusicAudioTrack::setId(const QString &value)
 {
     d->mId = value;
 }
@@ -221,7 +203,7 @@
     return d->mId;
 }
 
-void MusicAudioTrack::setParentId(const QString &value) const
+void MusicAudioTrack::setParentId(const QString &value)
 {
     d->mParentId = value;
 }
@@ -231,7 +213,7 @@
     return d->mParentId;
 }
 
-void MusicAudioTrack::setTitle(const QString &value) const
+void MusicAudioTrack::setTitle(const QString &value)
 {
     d->mTitle = value;
 }
@@ -241,7 +223,7 @@
     return d->mTitle;
 }
 
-void MusicAudioTrack::setArtist(const QString &value) const
+void MusicAudioTrack::setArtist(const QString &value)
 {
     d->mArtist = value;
 }
@@ -251,7 +233,7 @@
     return d->mArtist;
 }
 
-void MusicAudioTrack::setAlbumName(const QString &value) const
+void MusicAudioTrack::setAlbumName(const QString &value)
 {
     d->mAlbumName = value;
 }
@@ -261,7 +243,7 @@
     return d->mAlbumName;
 }
 
-void MusicAudioTrack::setAlbumArtist(const QString &value) const
+void MusicAudioTrack::setAlbumArtist(const QString &value)
 {
     d->mAlbumArtist = value;
 }
@@ -276,7 +258,7 @@
     return !d->mAlbumArtist.isEmpty();
 }
 
-void MusicAudioTrack::setAlbumCover(const QUrl &value) const
+void MusicAudioTrack::setAlbumCover(const QUrl &value)
 {
     d->mAlbumCover = value;
 }
@@ -286,7 +268,7 @@
     return d->mAlbumCover;
 }
 
-void MusicAudioTrack::setGenre(const QString &value) const
+void MusicAudioTrack::setGenre(const QString &value)
 {
     d->mGenre = value;
 }
@@ -296,7 +278,7 @@
     return d->mGenre;
 }
 
-void MusicAudioTrack::setComposer(const QString &value) const
+void MusicAudioTrack::setComposer(const QString &value)
 {
     d->mComposer = value;
 }
@@ -306,7 +288,7 @@
     return d->mComposer;
 }
 
-void MusicAudioTrack::setLyricist(const QString &value) const
+void MusicAudioTrack::setLyricist(const QString &value)
 {
     d->mLyricist = value;
 }
@@ -316,7 +298,7 @@
     return d->mLyricist;
 }
 
-void MusicAudioTrack::setComment(const QString &value) const
+void MusicAudioTrack::setComment(const QString &value)
 {
     d->mComment = value;
 }
@@ -416,7 +398,7 @@
     return d->mResourceURI;
 }
 
-void MusicAudioTrack::setRating(int value) const
+void MusicAudioTrack::setRating(int value)
 {
     d->mRating = value;
 }