His ensemble featured a large number of sidemen who went on to become noted for their own achievements, including Gene Krupa, Jack Teagarden, Frankie Carle, Jack Jenney, Toots Mondello, Irene Daye, Clark Yocum, Floyd O'Brien, Spud Murphy, Boots Mussulli, Brad Gowans, Turk Murphy, Teddy Grace, and Don Fagerquist.
Andy Hallett | Mal Duncan | Mal Michael | Mal Meninga | Samuel Hallett | Mike Hallett | Mal Young | Mal Ryder | Mal Reilly | Mal Pope | Mal Evans | Mal Donaghy | Les Fleurs du Mal | Les Fleurs du mal | John Hughes-Hallett | Henry Hallett Dale | Hallett Motor Racing Circuit | Hallett Cove, South Australia | Hallett Cove | Bien o Mal | William Hallett Ray | Mark Hallett | Mal Whitfield | Mal Webb | Mal (prince) | Mal Moore | Mal Logan | Mal Lewis Jones | Mal Hallett | Mal Bryce |
He was a featured soloist with several major bands, including Mal Hallett (1943), Gene Krupa (1944–1950), Artie Shaw (1949–1950), Artie Shaw's Gramercy Five (1949–1950), Woody Herman (1951–1952), Les Brown (1953), and the Dave Pell Octet (1953–1959).