Little Sonny (born Aaron Willis; October 6, 1932, in Greensboro, Alabama) is an American electric blues harmonica player, singer and songwriter.

[3] His first professional appearance was at the Good Times Bar in Detroit, playing in Washboard Willie's backing group.

[1] Another club stalwart, Eddie "Guitar" Burns, accompanied him on Little Sonny's debut single, "I Gotta Find My Baby" (1958), released by Duke Records.

By late 1969, Little Sonny recorded his debut album, the predominantly instrumental New King of Blues Harmonica, which he cut in less than six hours.

His accompanists included the keyboard player Rudy Robinson, a regular session musician in Detroit in the 1960s and 1970s, and the guitarist Aaron Willis, Jr., Little Sonny's son, who had both played on Hard Goin' Up over 20 years earlier.

Little Sonny performed on October 4, 2008, at the Motor City Blues & Boogie Woogie Festival, in Detroit, with Eddie "Guitar" Burns, Otis Clay and Bobby Rush.