Thomas "Fats" Waller (1904-1943) was a pianist, organist, composer, and entertainer who became one of the most prolific songwriters of the Jazz Age. His compositions, often written with lyricist Andy Razaf, combined sophisticated harmonies with infectious swing and humor, earning him recognition as both a serious musician and a beloved popular entertainer. Waller's ability to blend technical musicianship with accessibility made his work endure across generations and instrumental arrangements.
"Ain't Misbehavin'" stands as one of his signature compositions, a tune that reveals why Waller's songs remain staples in jazz education and popular music. The piece showcases his gift for melody that sits naturally in the voice while supporting rich harmonic movement underneath, making it ideal for adaptation across instruments including ukulele.