 Named after the famous touring bus used by Ken Kesey and the Merry Pranksters in the 1960s, Furthur was an improvisational jam band that performed music primarily from the extensive Grateful Dead songbook, as well as their own original music and that of several other well-known artists.In addition to the original members (with the exception of Jay Lane, who left the band in March 2010 to rejoin his previous band, Primus), the band's lineup included backup vocalists Sunshine Becker of the a cappella ensemble SoVoSó and Jeff Pehrson of the folk rock bands Box Set and the Fall Risk.Four months after Jerry Garcia's death in August 1995, the Grateful Dead officially disbanded.