Take a look at Thames & Hudson’s magnificently illustrated coffee table tome Off the Wall: Psychedelic Rock Posters from San Francisco, and among the phantasmagorical, hallucinogenic artwork promoting nights at venues such as the Fillmore, Winterland, Carousel and Avalon ballrooms, three names trailing clouds of lysergic glory occur more than any others – the Grateful Dead, Jefferson Airplane and Quicksilver Messenger Service. Yet although the Dead and the Airplane have become the stuff of legend, the other corner of the original San Fran acid-rock trinity has been rather forgotten. This 79-track boxset chronicling Quicksilver’s protean iterations over seven albums in the space of five tumultuous years – along with a generous helping of bonus tracks…