 It closes with a six-part, 20-minute conceptual title track inspired by Akkerman once eating a hamburger while watching cartoons at his hotel room in New York City and was put down in basic form during the 1973 Chipping Norton sessions.Released in May 1974, "Hamburger Concerto" peaked at number 5 in the Netherlands and number 20 in the UK.Van Leer claimed it was the band's "First proper work.