Thomas "Fats" Waller (1904–1943) was a pianist, organist, composer, and vocalist who shaped the sound of jazz and American popular music in the 1920s and 1930s. His virtuosic keyboard technique and infectious personality made him one of the most recorded artists of his era, and his compositions like "Ain't Misbehavin'" and "Honeysuckle Rose" became standards that outlasted the swing era itself.
Waller's gift was making complex harmonies feel effortless and joyful. He wrote music that swung naturally, sang with warmth and humor, and understood exactly how to craft a melody that stayed with listeners long after the record ended. For choral directors, his work offers a direct line to authentic jazz language and the rhythmic vitality that defined early American popular song.