First, my disclaimers. I limited this list to albums I actually own and have listened to obsessively at one point or another in my life. There are omissions. I own 10 Pearl Jam CDs and about as many Metallica albums, but I couldn't find one album that warranted being ahead of any of the 20 here. It's heresy, I know. I *tried* to avoid greatest hits albums — notably, Tom Petty's (for the song Last Dance With Mary Jane), The Stones, and Springsteen all fell into this catch — but one greatest hits album still made my top two. I'm like that. Contrary to my own rules. 1. Led Zeppelin, albums I, II, IV and Physical Graffiti No band deserves to be on this list four times, even if I have a tattoo of the band's symbols on my upper arm, which I do. But I can't choose just one. The first album was the statement album, with the sound that separated Zeppelin from every other band and paved the way for Black Sabbath, Metallica, Van Halen, et al. II just rocks. Every song on I...