The blues genre is a music style that originated in the African American communities of the Deep South in the late 19th century. It combines elements of African musical traditions, spirituals, and folk songs, characterized by its use of specific chord progressions, particularly the twelve-bar blues. The genre often expresses themes of sorrow, hardship, and resilience. Instruments commonly used in blues music include the guitar, harmonica, and piano. Notable artists like B.B. King, Muddy Waters, and Etta James have significantly influenced the genre, helping to shape its sound and expand its reach. The blues has also laid the groundwork for many other music styles, including rock and roll and jazz.