NowPlayingTrack
What a listener is hearing right now: a record, or the station talking
NowPlayingMount
One way to listen to this station right now
NowPlayingShow
The programme on air, as a listener would be told it
NowPlaying
What the station is playing, for anything that wants to display it
NowPlayingLyrics
The words of whatever record is on air, and where it is in them