I mentioned a couple songs he had ion the Rock 'n' Roll: The Early Years 2 CD I reviewed yesterday.
Was good friends with Glenn Miller and joined the Dorsey Brothers in 1934. After the brothers split, he remained with Jimmy Dorsey until 1939 when he joined Will Bradley and they had their biggest hit "Beat Me Daddy, Eight to the Bar" which they recorded in early 1940.
He was referred to as "Eight Beat Mack" in the song "Down the Road a Piece.
In 1956, he was chosen as the leader of the revived Glenn Miller Band.