Billy Stewart was an American rhythm and blues singer and pianist active during the 1960s. He was known for his distinctive scat singing style and his ability to improvise, which brought a jazz influence to his R&B sound. Notable for his work with Chess Records, Stewart's most influential recordings include his unique interpretations of George Gershwin's "Summertime" and the standard "I Do Love You." His contributions significantly widened the scope of R&B and paved the way for future genre-blending artists.