The following requirement must be fulfilled:
Desired tracks are available in the application.
To play back tracks, albums or a playlist proceed as follows: 
1.
If you want to play back tracks or an album:
1.
Click the Music library entry in the navigation tree on the left.
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The music browsing screen is displayed in the stack view. Another double-click changes into the detailed browsing view that is displayed with focus on the first item of a selected stack. 
2.
Select the respective stack, album or track you want to play back and click the Play button on the lower task bar.
à
Playback is started. Switching to another screen will not stop the playback. A small display in the lower left corner of the main window stays visible and shows the title and play back time. You can click this display to get back to the music browsing screen. 
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If you selected your album from a stack that contains more than one album, the playback is automatically continued with the following album. Likewise, if you selected the check box of a single track in an album, the playback is automatically continued with the following tracks.
2.
If you want to play back a playlist:
1.
Click the respective playlist entry in the Playlists area of the navigation tree.
2.
Click the Play button on the lower task bar.
à
Playback is started. Switching to another screen will not stop the playback. A small display in the lower left corner of the main window stays visible and shows the title and play back time. You can click this display to get back to the Playlist screen.
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You have started the playback of your tracks, albums or of a playlist.
See also
Music Browsing Screen

Starting Music Playback (Library or Playlist)