During the late '60s and early '70s, Underwood played lead guitar with singer/songwriter Tim Buckley on seven of the nine albums Buckley released while alive, including Happy Sad and Starsailor. Underwood also appeared on several posthumous Buckley CDs, notably Dream Letter: Live in London 1968 and Works In Progress. In the '70s and '80s, Underwood wrote extensively about music and musicians. His articles, interviews and reviews appeared in dozens of periodicals, including Down Beat (West Coast Editor, 1975-1981), L.A. Times, L.A. Weekly, Rolling Stone, Pulse, Jazz Forum, L.A. Free Press, New Realities, Body/Mind/Spirit, New Age Journal, and many others.
