The folk-rock group Lamb was one of San Francisco's more visible voices during the psychedelic era. The ensemble was dominated by singer Barbara Mauritz and multi-instrumentalist Bob Swanson, and their signature sound blended folk, pop, jazz, gospel, classical and avant-garde framed by Mauritz's poetic, ephemeral lyrics and strong bluesy voice. Catching the attention of Bill Graham when they opened Winterland for Crosby, Stills, Nash & Young in November 1969 ultimately led to management under Graham, and their experimental debut album, "A Sign of Change" was on the Fillmore label. For their second, more rock-influenced album, "Cross Between" Lamb moved over to Warner Brothers, and their third and final effort "Bring Out the Sun" was even more mainstream, and its co-billing of Lamb AND Mauritz foreshadowed her shortly-thereafter solo attempt. Her solo career never really took off however, and Lamb basically flittered off into relative obscurity, save for their redeeming appearance on the celebrated Last Days of the Fillmore album alongside megabands like the Grateful Dead, Santana and Creedence Clearwater Revival.