Guitar virtuoso Trey Anastasio was one of jam-band phenomenon Phish's masterminds, and his solo career has continued his Grateful Dead-like following (or should we say Phish-Head?). He's a workhorse in the music world, having collaborated with everyone from Carlos Santana to Dave Matthews and has even successfully dabbled in classical composition. 2006's 18 Steps EP is available for download via LivePhish.