I think the first recording I ever heard of gamelan music was the old Nonesuch record entitled Music from the Morning of the World, and it's still a pretty good introduction.
I got to play some gamelan in college, and I was once privileged to hang out with the people who ran the American Gamelan Institute-- which still exists, and is a tremendous resource, but they've moved to the opposite coast :-(
Got this from a quick Google:
http://www.gamelan.co.uk/faq.htmlBalinese gamelan uses similar ingredients-- lots of gongs and chimes and other metallic noises-- but it's a lot more abrupt. The Javanese vibe is incredibly stately and languorous. Hope this helps.
Regarding the tempo of dance music, it's been increasing over time, hasn't it? I know that the old disco hits, even the ones that didn't suck at the time, now all sound quaint and stodgy. I used to think that it was because of aerobics; dancers have grown used to peppier tempo because they got accustomed to it in the gym-- but I don't think so any more, because as far as I can tell it's still going up.
Steve Hillage, who's the brains behind System 7 and a fellow traveller of the Orb, has a concept of a "spectrum" of tempo-- he says the transition from a relaxed 100 BPM groove to a superfast 200 BPM jungle workout isn't as jarring as you'd think, because the 200 BPM could be perceived by the dancer as an "octave" of 100 BPM. It's an intriguing theory, but I think I place it in the same theoretical dustbin as the notion that some day I'll learn to hear Schoenbergian tone rows!