When you select a track or album you can choose to play it as the next
track or album. This means the current track continues to play
but the selected track will be the following to play, even when
the track is not next in the playlist. This is done using an internal queue
containing play next requests. See also Playlist overview. Basically
there are two kind of places where the play next request can
be done: When choosing play next from the playlist, the
selected track is queued to play next. When choosing
play next from outside the playlist, the
album or track should be added when not in playlist yet. But even when the album
or track is already in the playlist, the user might want to add the album
anyhow. It is also possible to make the current now playing playlist to be
cleared on choosing play next. In that case all tracks are removed except the
currenty playing one. The chosen track will be added to the current playing one.
All this behavior can be modified in thes Playlist and
Player page of the preferences. Note: To determine if an album is already in the
playlist, it is checked if the album is available in full with tracks in
sequential order. Otherwise an album is considered not to be in the playlist
yet.