The recently-discovered YouTube clip below features a 1983 jam session with Jack (on keyboards), Fela Kuti and Jethro Tull's Ian Anderson.  (Kuti, an Afrobeat pioneer who helped revolutionise world music, is the subject of a new off-Broadway show in Manhattan.)  Visit YouTube for additional footage of Jack, including a rare Israeli television broadcast of Smiles & Grins

(note : 1983 clip has since been removed by the uploader)