Okay, so I don't play much Minecraft and I have a feeling that alot of the people here might hate it or something, but holy christ, the soundtrack, created by C418, is just fantastic.
Volume Alpha: https://c418.bandcamp.com/album/minecraft-volume-alpha
Volume Beta: https://c418.bandcamp.com/album/minecraft-volume-beta
There's also the soundtracks to Super Meat Boy and Binding of Isaac, by Danny Baranowsky.
And then there's also the soundtrack to Super Hexagon, by Chipzel.