I agree on black sabbath and pink floyd. Pink floyd have a unique style in music and to appreciate them you have to listen to their music several times. Also their songs are large and usually are continious in their albums and i don't think that is easy to make a game about them or if the audience will appreciate that game.
Also Megadeth have a lot of nice songs to make a game with and Alice in chains! Ok alice in chains have less but i love their first two albums!







