Songwriter ("Primrose Lane", "Pastel"), composer, conductor, arranger, bassist and tubist who, after his college education, performed as bassist within the groups of Louis Armstrong, Benny Goodman, Nat 'King' Cole and Lester Young, later forming his own trio. Starting in the early 1950s, prior to which he helped bring about the amalgamation of L.A.'s hitherto segregated musician's union, Callender was a much in demand studio musician, both on bass and on tuba. He appeared on many television programs and in jazz festivals, and made many records. Joining ASCAP in 1957, his chief musical collaborator was Wayne Shanklin.