By filling this out, I feel like taking a Library 160 exam drunk....you know there's no way to possibly screw up, but yet there's no possible way you should be right either....
1960s: "I Want You Back" by Jackson 5
1970s: "Ohio" by CSNY
1980s: "Sweet Child O Mine" by GnR
1990s: "Cherub Rock" by Smashing Pumpkins (honorable mention for "Race for the Prize" by The Flaming Lips (live, with confetti everywhere

), barely sneaking into the 1990s....I had to look it up to be sure
2000s: "Clocks" by Coldplay
Thanks for destroying my afternoon....picking one song is so hard...