For someone who's been shooting concerts since the '70s, you'd think Jay Blakesberg would be burned out on music. Not so much, it turns out. On the heels of releasing his latest book, JAM, Blakesberg is still striving to capture the feverish energy that explodes from the stages when the greatest jam musicians trade notes. His work has appeared in Rolling Stone, Guitar Player, Relix and Acoustic Guitar, and he's photographed everyone from the Grateful Dead and Phish to the Rolling Stones and Tom Petty. We recently spoke with the legendary photographer about how he decides which photos make the cut.