early 1900s (ie ~1920s-1950) swing/big band and roots of r&b
50s and 60s rock 'n' roll (before Cream ruined everything) and motown
70s there was some good glam rock (t. rex,) as well as FUNK
70s and 80s gave us punk rock
the 90s gave us grunge and alternative and beck
i really couldn't name a single decade or era