@GelatinousEncoreIt could be the nostalgia talking. Ruby was the first Pokemon game I REALLY got into, having skipped the Johto generation and only being permitted to play Pokemon Red from time to time on my bro's Game Boy.
I watched the first season of the anime almost religiously though.....
Ahem, anyways, I just love the sound the Game Boy Advance produced for that soundtrack. Drill Dozer also comes to mind, sharing a similar sound style that I absolutely can't get enough of. Without a doubt, every generation of Pokemon has great music to offer.
Really looking forward to seeing what Black and White have in store. I've only heard one song so far
(Tower of Heaven?) and I thought it was awesome.