Alex or Aleck Miller, known later in his career as Sonny Boy Williamson, was an American blues harmonica player, singer and songwriter. He was an early and influential blues harp stylist who recorded successfully in the 1950s and 1960s. Miller used various names, including Rice Miller and Little Boy Blue, before calling himself Sonny Boy Williamson, which was also the name of a popular Chicago blues singer and harmonica player. To distinguish the two, Miller has been referred to as Sonny Boy Williamson II.

John Lee Curtis "Sonny Boy" Williamson was an American blues harmonica player, singer and songwriter. He is often regarded as the pioneer of the blues harp as a solo instrument. He played on hundreds of recordings by many pre–World War II blues artists. Under his own name, he was one of the most recorded blues musicians of the 1930s and 1940s and is closely associated with Chicago producer Lester Melrose and Bluebird Records. His popular songs, original or adapted, include "Good Morning, School Girl", "Sugar Mama", "Early in the Morning", and "Stop Breaking Down".