Jazz originated in New Orleans in the late 1800s, combining African rhythms, American band traditions, and European harmonies. It is characterized by improvisation, syncopation, solo performances, and small combos with frontline melody instruments and backing rhythm sections. Important jazz instruments include brass, reeds, piano, bass, guitar, and drums. Legendary jazz composers and musicians who helped develop the genre include Louis Armstrong, Duke Ellington, Dizzy Gillespie, and Thelonious Monk. Rock and roll developed in the 1950s from blues and country music, popularized by artists like Chuck Berry, Little Richard, and Elvis Presley. It spread through the US and British Invasion, using electric guitars