A few weeks after the group was formed, Jerry Peloquin departed, in part because of his disdain for the others' drug use. Although he was not a drummer, singer-guitarist Skip Spence (who later founded Moby Grape) was then invited to replace Peloquin. In October 1965, after the other members decided that Bob Harvey's bass playing was not up to par, he was replaced by guitarist-bassist Jack Casady, an old friend of Kaukonen from Washington, D.C. Casady played his first gig with the Airplane at a college concert in Berkeley, California, two weeks after he arrived in San Francisco.