Cheers!
I was thinking something more colourful like Debussy or Beethoven, I think perhaps Slayer might not be healthy for mind to be subjected to. I'm quite involved with music generally and I've always wondered what different things will do. Would Dark Moody music give you nightmares? Or would listening to James Brown make you have a super funky dream (whatever that would be like)
If anyone's tried listening to music while dreaming I'd be interested to hear what effects it has had!