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I don't think Superunknown has been mentioned. That was a brilliant album. Maybe more influential to overall rock genre than any other grunge album, with maybe the exception of Ten.

Californication, though BloodSugarSexMajik was probably more groundbreaking.

In the running:
Beatles - Let it Be
Smashing Pumpkins - Melon Collie and the Infinite Sadness
Led Zeppelin - IV
Pearl Jam - Ten
Nirvana - Unplugged
Jay-Z - Blueprint
Dr. Dre - Chronic

Those...