The Clash, "London Calling"

I don't own much punk rock, but the album "London Calling" is one of my favorites of all time. You can't beat an album that opens up with this, then ends with "Train in Vain"--a close contender to the Rolling Stones' "Let It Bleed," which opens up with "Gimme Shelter" and ends with "You Can't Always Get What You Want." So if you don't have it yet, throw our some of your Green Day albums and make room for this one.