The band self-produced two EPs that drew attention on the underground circuit before signing to Vanguard Records in 1966. Their debut album, "Electric Music for the Mind and Body", followed in 1967. It contained their only nationally charting single, "Not So Sweet Martha Lorraine", and their most experimental arrangements. Their second album, "I-Feel-Like-I'm-Fixin'-to-Die", was released in late 1967; its title track, with its dark humor and satire, became their signature tune and is among the era's most recognizable protest songs. Further success followed, including McDonald's appearance at Woodstock, but the group's lineup underwent changes until its disbandment in 1970. Members of the band continue in the music industry as solo recording artists and sporadically reconvene.