haha that was amazimg!! i would have loved to actually see that live. thanks so much for this link, there's a ton of stuff like this on YouTube about AB.
however, i do find it hard to believe he doesn't know all the words haha. what rock music fan doesn't know the words to Enter Sandman?!? especially when metallica is one of his major influences.
they should really consider doing a Metallica cover on their next tour, and have Mark sing it
... that would be sweet.