I'm listening on the net to the whole version of the music that is playing in the background whilst Prince is getting it on with Appolonia in his basement room. Can anyone tell me what this piece is called?

It's the b-side to Purple Rain titled "God"-the instrumental version. There were two versions of this song-one vocal and one instrumental, although they're quite different(i have no idea why).

You've likely heard the vocal version on the "Hits" 3rd CD-which sounds more gospel-like.

Thanks

Great song.