I'll bet something like this has been done, but I haven't seen one, so I made one!
The premise is simple: List your favorite albums and/or artists and/or songs corresponding to each of the genres listed below. Some bands will fit into more than one depending on the decade/album/song.
80S: Depeche Mode, Tears for Fears, U2, Duran Duran, Killing Joke, The Cure, Human League
ALTERNATIVE: Les Claypool, Beck, Ohgr
AMBIENT: C17H19NO3, Boards of Canada, Tim Hecker
BLUES: N/A
BLUEGRASS: Uncle Earl, Painted Saints
CHILDREN'S: N/A
CLASSICAL: Bach, Kronos Quartet, Apocalyptica
COMEDY: STWPT, Weird Al, Dr. Demento
COUNTRY: N/A
DANCE: Pentaphobe
DARKWAVE: Teargas and Plateglass
EASY LISTENING: David Gray?
ELECTRONIC: Juno Reactor, Amon Tobin, YMO, Kraftwerk
FOLK/WORLD: Ekova
GRUNGE: Alice in Chains
HIP-HOP/RAP: Gorillaz
HOLIDAY/RELIGIOUS: Handel's Messiah
INDIE: The Arcade Fire
INDUSTRIAL: Skinny Puppy, KMFDM, Einstürzende Neubauten, Ministry, Die Form, Scorn, Revolting Cocks
J-POP/J-ROCK: N/A
METAL: Metallica, Dethklok, Finntroll, Black Sabbath, White Zombie
NEW AGE: Phillip Glass, Delerium, Enigma
OPERA: Wagner, Joachim Witt
POP: Dido, LEN
ROCK: Eisbrecher, Pink Floyd, The Beatles, Brian Eno, Cocteau Twins
SOUNDTRACK: Mark Mancina, Clint Mansell, Rob Zombie, Michael Andrews