Alan Leonard Broadbent is a New Zealand jazz pianist, arranger, and composer known for his work with artists such as Sue Raney, Charlie Haden, Woody Herman, Chet Baker, Irene Kral, Sheila Jordan, Natalie Cole, Warne Marsh, Bud Shank, and many others.

Charles Edward Haden was an American jazz double bass player, bandleader, composer and educator whose career spanned more than 50 years. Building on the work of predecessors such as Jimmy Blanton and Charles Mingus, Haden helped to revolutionize the harmonic concept of bass playing in jazz, evolving a style that sometimes complemented the soloist, and other times moved independently, liberating bassists from a strictly accompanying role, to allow more direct participation in group improvisation.