Blues

Emerged from the spirituals, work songs, and field hollers of African American communities in the Southern United States. The genre is defined by specific chord progressions, most notably the 12-bar form, and its use of 'blue notes' and call-and-response patterns. The instrumentation often centers on acoustic or electric guitar and harmonica, delivering a raw, emotionally direct timbre. Lyrically, it articulates themes of hardship, loss, and perseverance. This foundational tradition directly shaped the development of jazz, R&B, and rock and roll, becoming a cornerstone of 20th-century popular music.