Liars

Seven albums, all different from each other. Different in structure, intentions, types of sounds, and production. They recorded Sisterworld using a plate of eggplants instead of an engineer, just to test the Low-Fi.
Speaking of historical value - which has nothing to do with the value of the records - Liars put many sacred monsters to shame. And probably, as "musicians," they are the best of this millennium. Now they just need a Metal album.