Williams’ story begins in Virginia, just south of Washington, D.C. There he was exposed to a wide variety of music at an early age, starting with country and bluegrass and working his way up through hip-hop and go-go, a brand of funk particular to that part of the country. Once he began playing guitar, Williams’ sphere expanded to what he calls “the post-pseudo-skateboarder punk-rock rebellious type of thing, Black Flag and Sex Pistols and Ramones, Dead Kennedys, things like that. That slid into the more melodic college rock, like the Cure and the Cult, the Smiths, R.E.M.’s first five or six records.”

Then came the Grateful Dead, a seminal influence on Williams’ own music. “I studied and learned their music and went to the shows,” he says, adding that the impact of Jerry Garcia on his attitude toward music remains incalculable. Another major influence was Michael Hedges, the late virtuoso acoustic guitarist. “He was really excelling in a whole different world from what I knew,” says Williams...