Robert Leo Hackett was a versatile American jazz musician who played swing music, Dixieland jazz and mood music, now called easy listening, on trumpet, cornet, and guitar. He played Swing with the bands of Glenn Miller and Benny Goodman in the late 1930s and early 1940s, he played Dixieland from the 1930s into the 1970s in a variety of groups with many of the major figures in the field, and he was a featured soloist on the first ten of the numerous Jackie Gleason mood music albums during the 1950s.