The Allmans blew him away and got him hooked on learning guitar. He kept at it something fierce and is quite an accomplished guitarist these days.
I only went to see Sue but the Allmans were quite good as well.
A few years back Derrick played a gig in Jax as a sub to Jimmy Buffet. Trucks left the stage before Buffet came on and Buffett called him back on stage and they did the rest of the concert together. Trucks is an exceptional guitarist and Buffet actually stepped back several times to let him riff. It was an absolutely awesome concert.