The musicians playing in jug music revival groups went on to form other bands. John Sebastian founded the pop music group the Lovin' Spoonful and later continued as a successful solo artist. Country Joe and the Fish came from the Instant Action Jug Band. Mungo Jerry, which evolved from an earlier blues group, Good Earth, was in effect a jug band on their first live performances and recordings, thanks to their use of jug (played by the group's banjo player, Paul King, who left in 1972), and washboard, contributed by regular "extra member" Joe Rush. Jesse Colin Young moved to the West Coast and formed the Youngbloods, whose first hit was "Grizzly Bear," a jug band standard. Another group with jug band roots was the Grateful Dead. Jerry Garcia, Bob Weir, and Ron "Pigpen" McKernan were in Mother McCree's Uptown Jug Champions before forming the Warlocks, which evolved into the Grateful Dead. A self-titled CD of Mother McCree's jug band music recorded in 1964 was released in 1999. Maria Muldaur, Geoff Muldaur, David Grisman, and Stefan Grossman all continued with successful solo careers. The Nitty Gritty Dirt Band also started as a jug band.