For me it is The Doors, Absolutely Live. This was the third record that I ever bought in my life and it was in 1970, the year of it's original release. I was living abroad in the south pacific and I recall as I was picking it up (mostly because the album cover looked so effing cool with Jim Morrison in his leather pants and the crazy lighting) a teenage boy (I was 11 at the time) came up and advised me not to buy it as it "wasn't as good as the studio albums". Luckily I was stubborn and bought it anyway - what a crazy trip into the late 60s / early 70s. I remember listening to this on my crappy "stacking" turntable over and over. Anyway - I listened to the first half tonight and it is every bit as great as I recall, from Robbie Krieger's awesome guitar solos, to Ray Manzarek's otherwordly organ playing, John Densmore's faithful backbeat and of course Jim's one of a kind vocals. It's like walking into a time machine. So, what's your favorite live album?