Smashing Pumpkins' Siamese Dream.
While I still don't think I can understand the world-wide idolatry these sometimes whiny punk-retro rockers engender, I can't deny that Billy Corgan locks me in every time I hear 'Cherub Rock' or 'Today'. I catch myself with my fingers drumming, marvelling at the sheer sonic power of the guitars. In these coptic times of Britney et. al., that ain't bad.