 After the addition of Akkerman to van Leer's rock trio in late 1969, the band named themselves Focus and were the pit band for the Dutch production of the rock musical "Hair".Their debut album "Focus Plays Focus" (1970) gained little attention, but their follow-up album "Moving Waves" (1971), and its lead single "Hocus Pocus", earned the band international recognition.Their success continued with "Focus 3" (1972) and "Hamburger Concerto" (1974), the former containing their second hit single, "Sylvia".