the music that was playing in Purple Rain during the scene where P was feelin up Appolonia from behind, does that song have a name? is it possible to get on a cd somehow?

I think it is the Instrumental version of "GOD". It was a B-side of Purple Rain. I is on Disc 3 of The Hits/B-sides track#18.
[Edited 6/19/05 14:09pm]

Pondwater is right, but no it's not available on CD, at least not the Instrumental, and it's quite different.