Been playing some Crypt of the Necrodancer lately. I'm not sure where they found people to make the music, but they did an amazing job. I don't really like DDR or music you're actually supposed to dance to in general, let alone the garbage you'll probably hear if you ever drive past a club... but this is something else.
Dungeons of Dredmor has an unusually catchy theme suggestive of big-screen cinematics. The rest of the game's music is pretty meh though.
Jazz is kind of my thing, though. Here's one of the most mind-blowing recordings that I know of: https://www.youtube.com/watch?v=PloycJeavQY