Thomas "Fats" Waller (1904-1943) was a virtuoso pianist, organist, and vocalist who became one of jazz's most influential composers and entertainers. His prolific output shaped the Great American Songbook, and his ability to blend sophisticated harmonic language with infectious swing and humor made him a dominant force in Harlem's musical scene during the 1920s and 1930s.
Waller's genius lay in crafting songs that worked equally well as instrumental vehicles and vocal showcases. "Ain't Misbehavin'," written with Andy Razaf in 1929, exemplifies his gift for merging musical wit with memorable melody. His influence extends far beyond the jazz world; his songs remain core repertoire for singers and musicians across all genres.