If you had a Dreamcast like me, you will know these games well. Sure, Rez was out for PS2, and a version ofJSR was out for the original Xbox as Jet Set Radio Future, but they came out for DC first I believe, and they were awesome. More examples of fantastic gameplay, but music that really sealed the deal, and these tracks are also available to download on the lovely Interwibbles- JSR music is here, and Rez is here. There is in fact a CD of music from and inspired by Rez, but its pretty rare and thus expensive. However, RezHD is on 360 arcade, I recommend you give it a play!
And If you like the music, you should check out Underworld, and their song Rez, which inspired the game! (It’s avalible on Youtube, though it seems to merge into their song Cowgirl, which is another good track so you should check out that too!!