sentences:  During this period, Parks worked frequently as a session musician, arranger, and songwriter and became acquainted with future close friends Randy Newman, Harry Nilsson, and Beach Boys bandleader Brian Wilson.Parks also performed on the Byrds' album "Fifth Dimension" and declined an offer by David Crosby to join the band.In 1965, Parks briefly joined Frank Zappa's Mothers of Invention on stage, where he was referred to as "Pinocchio."