For an era and city that are ripe with legendary psychedelic shows, April 15, 1970 at Winterland is a particularly compelling night. Quicksilver Messenger Service appeared alongside The Dead and The Airplane, combining to make what many might argue is the holy trinity of the SF Sound. For a show of such epic proportions, surprisingly little is known about it outside of the recordings that are available - there is no known poster or handbill, and some suggest that the band promoted the show themselves outside of the monopolizing clutches of Bill Graham Presents. Regardless, the music and recording quality are unparalleled and Quicksilver's set is as good as it gets. Presented here in a deluxe clear vinyl addition with a bonus CD featuring an extra track.