Jitterbug Waltz is a jazz waltz in 3/4 time composed by Thomas "Fats" Waller in 1942, recorded on March 16 of that year with his group Fats Waller and His Rhythm for RCA Victor. Waller performed the piece on Hammond organ rather than his customary piano, making it one of the earliest jazz recordings to feature the instrument in a lead role. The composition originated during a six-week engagement at Chicago's Panther Room, reportedly inspired by piano exercises practiced by Waller's son Maurice. The title was suggested by Waller's manager Ed Kirkeby, as recounted in Kirkeby's biography Ain't Misbehavin': The Story of Fats Waller. Set in E-flat major, the melody unfolds in gentle, descending phrases that create a dreamy, swirling quality at odds with the high-energy connotation of its name. Maurice Waller later claimed it as the first jazz waltz, and while that assertion is difficult to verify, the 3/4 meter was indeed rare in jazz before 1950. Waller composed the piece near the end of his life; he died in December 1943 at age 39 after years of relentless touring and declining health. Dinah Washington recorded a vocal version in 1957 with lyrics by Charles R. Grean and Maxine Mann, while instrumental interpretations by Art Tatum, Eric Dolphy, and David Murray have carried the tune across stylistic boundaries from stride to avant-garde.