In early 1970, Bob Lewis and Gerald Casale formed the idea of the "devolution" of the human race after Casale's friend Jeffrey Miller was killed by Ohio National Guardsmen firing on a student demonstration. Mothersbaugh joined Devo in 1974. After the band underwent a few line-up changes, Bob Mothersbaugh became part of the most popular five-piece incarnation, which included the Casale brothers: Gerald and Bob ("Bob 2") and the Mothersbaugh brothers: Mark and Bob ("Bob 1"), as well as drummer Alan Myers. In 1981, Mothersbaugh with Devo served as Toni Basil's backing band on "Word of Mouth", her debut album, which included versions of three Devo songs, recorded with Basil singing lead.