Jazz became the unchallenged popular music of America during the Swing era of the 1930s and 1940s.
New Orleans musicians and musical styles continued to influence jazz nationally as the music went through a rapid series of stylistic changes. Jazz became the unchallenged popular music of America during the Swing era of the 1930s and 1940s. Later innovations, such as bebop in the 1940s and avant-garde in the 1960s, departed further from the New Orleans tradition.