In Germany, he worked mostly as a DJ until producer Frank Farian spotted him for his new Boney M. group. He became the sole male singer in the group, although Farian later revealed that Bobby made almost no vocal contributions to the group's records, with Farian himself performing the male parts on the songs in the studio. Liz Mitchell claimed that only she, Marcia Barrett and Farian had sung on the hit recordings. Farrell did, however, perform live in some of the various incarnations of 'Boney M', including the main 1970s incarnation. Farrell left the group in 1981, after clashes with Farian. He was replaced by Reggie Tsiboe. He re-joined in 1984, and continued as a member until it finally split in 1986.