Loop
Jesus And Mary Chain
Felt
Mudhoney etc etc etc
I wouldn't leave out bands like the ones that you find on the Nuggets compilations, simply because they were tremendously influential on other bands that went on to form the core of this evil beast that they call alternative music, both musically and aesthetically. Just think about bands like The Third Bardo and the like, and it would all make sense.
The Third Bardo