Along with the Grateful Dead and Jefferson Airplane, Quicksilver Messenger Service were one of the first and best of the San Francisco '60s psychedelic bands. Though they shared with their peers an improvisational bent and eclectic roots in blues, jazz, folk, and rock, what helped set them apart was the distinctive twin-guitar work of John Cipollina and Gary Duncan, two virtuosic players. When New York singer-songwriter Dino Valenti became their frontman, their sound became more accessible and they scored a couple of minor hits before disbanding in the mid-'70s.