William Alexander “Sonny” Greer (December 13, c. 1895 – March 23, 1982) was an American jazz drummer and vocalist, best known for his work with Duke Ellington. Greer was born in Long Branch, New Jersey.

Greer started his career in his mid-teens when he began playing at resort hotels along the Jersey Shore with local orchestras. After a performance in the Plaza Hotel, he received an invitation to appear in Washington, D.C. with the Howard Theatre where he played for three years until he met Duke Ellington. Greer was balancing his commitments with Ellington and the Howard Theatre until the mid-1920s when he worked exclusively with Ellington.

Greer was Ellington’s first drummer, playing with his quintet, the Washingtonians, and moved with Ellington into the Cotton Club. As a result of his job as a designer with the Leedy Drum Company of Indiana, Greer was able to build up a huge drum kit worth over a then-considerable $3,000, including chimes, a gong, timpani, and vibes.

Greer was constantly on tour with the Ellington Orchestra and was there for its rise to fame in the 1930s and 1940s. Greer took the spotlight during the performances as the organization of his drum set drew the audience’s eyes. Music critic for the New York Times, John S. Wilson, wrote that Greer was “enthroned on a stand on which he was surrounded by a glittering array of paraphernalia.”Wilson continues to write that this included instruments such as chimes, tom-toms, snare drums, bass drums, and a gong that was “set up in back of him as though to form a massive halo.”