Song + Composer in TIE 1990 ?

There is this incredible atmospheric, dark, Nick Cave like track when Kelly is *beep* up on crack (i assume it is?) and those guys rape her. This is when Shaun, Gadget, Harvey, Kelly,Trev and those 2 guys take e and find this tribal drums, hippie type gathering by chance.

I couldn't find who it is by. Some of the lyrics are:

"This is a God song
Slip away, slip away"

BTW, the way the party scene is shot and how the characters experience it, when the e kicks, is the most realistic i've seen and closest to my own experience. I haf to laugh, in a good way, because i remember doing the same, when Shaun finds that older lady in her caravan and completely free of inhibitions - i suppose like when you are a child - just starts opening up to her with such exuberant and raw emotion.

Conversly, when the experience for Kel transitions from the e high to a dark place, with the whatever smokes, this reminds me of the coming down when your (or just me, maybe?) seratonin and paranoia *beep* kicks in.

Anyway, got a bit off the track, there.

Brilliant stuff, would b great 2 see a movie, but great stuff should stop when at its peak?

Cheers
Nick