If you don't know bands like The Beatles, or Led Zepplin, or Pink Floyd, Elvis, etc, then there is really, really something wrong with you. Like, really, really wrong.
Bands like From First to Last, and He Is Legend, and Greeley Estates, etc, and not being known isn't that uncommon. I actually had to introduce FFTL to alot of people.
But Depeche Mode, i mean, who hasn't heard of them...really.