On December 10, 2007, Led Zeppelin came back to fiery life for a 16-track set in London, documented in the concert film/album Celebration Day. With the late John Bonham’s son Jason on drums, the band do their famous catalog proud while continuing to tinker. “Black Dog” becomes more lurching than driving; “Stairway to Heaven” is made stunningly intimate. Given that Zep did so much to transform the blues, it’s no surprise that their own songs refuse to remain the same.