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John Chalmers MacGregor, better known as Chummy MacGregor, a musician and composer, was the pianist in The Glenn Miller Orchestra from 1936 to 1942. He composed the songs "Moon Dreams", "It Must Be Jelly", "I Sustain the Wings", "Doin' the Jive", "Sold American", "Cutesie Pie" in 1932 with Bing Crosby and Red Standex, and "Slumber Song". He co-wrote the song "Why Don't We Say We're Sorry?" for the post-war Glenn Miller Orchestra led by Tex Beneke in 1947. He was portrayed by Harry Morgan in the 1954 Universal Pictures biopic The Glenn Miller Story. From Wikipedia (https://en.wikipedia.org/wiki/Chummy_...) under Creative Commons Attribution CC-BY-SA 3.0 (http://creativecommons.org/licenses/b...)