#tbt Sonic Youth / Daydream Nation (1988)
What many would consider to be the epitome of indie rock, Daydream Nation set the bar for with would later become one of the most iconic double albums to come out from a band not signed to a major label. So iconic, in fact, it was chosen by the Library of Congress to be preserved in the National Recording Registry in 2005.
#tbt Dinosaur Jr / Green Mind (1991)
I know many people would argue that I should pick an earlier Dinosaur Jr album, prior to the departure of Lou Barlow, but this was the album that introduced me to them, so nostalgia wins this round. Wikipedia calls Dinosaur Jr “Alternative Rock”, and to be quite honest, I have no idea what “Alternative Rock” means, aside from rock music that came out in the 90’s that wasn’t Ace of Base.