Keller Williams has been called guitar's mad-scientist, a one-man-band for the new millennium and dozens of other clever sobriquets dreamed up by fans and music journalists trying to get a handle on his uplifting and ever-shifting style of music. Williams is considered by some but not by himself, to be a master of the acoustic guitar, known for his ability to solo over layers of spontaneously created loops. He is a generous performer who plays down to earth acoustic music that defies any effort to find a convenient pigeonhole.