I haven't listened to much funk besides James Brown and Funkadelic/Parliament. I'll give the others a listen though. I'm also pretty ignorant when it comes to bluegrass, so I'll look into getting ahold of some.

But what I initially was trying to say is that classical is great stuff when you're high - if you've first taken the time to find a composer you like, and develop an appreciation for it, just like with rock or funk or bluegrass or whatever.
Brey, classical is not 'old' music necessarily. There is some ridiculously progressive stuff that has been put out by contemporary composers like Igor Stravisnky, Alban Berg, and Steve Reich, to name just a few.

Check out the Steve Reich song "Come Out" and tell me that's old music. Reich is great, but my personal fav is Mozart (symphonies and sonatas, and some operas) - its blatantly brilliant, and can be incredibly visual and emotional when you're high, and sometimes when you're not.
Alright I'll stop beating this dead horse for now.