The Sonics, The Dirtbombs, The Seeds, The Stooges, 13th Floor Elevators, The Remains, The Black Lips and even the Hives are garage. but not the Beatles or the Doors, etc.
I agree with Asmodean But just another point: I know The Doors was "slipstream" something between mainstream and underground (underground includes garage, protopunk...). It was music which grew up from underground but had a mainstream succes. Same as a Pink Floyd.