Jazz standard and Billy Strayhorn's "Take the 'A' Train" (1941). With the big bands struggling to keep going during World War II, a shift was happening in jazz in favor of smaller groups. Some swing era musicians, such as Louis Jordan, later found popularity in a new kind of music, called "rhythm and blues", that would evolve into rock and roll in the 1950s. Bebop emerged in the early 1940s, with Charlie Parker, Dizzy Gillespie and Thelonious Monk leading the way. It appealed to a more specialized audiences than earlier forms of jazz, with sophisticated harmonies, fast tempos and often virtuoso musicianship.
Jazz Fest Wien Square. Apart from jazz, soul, blues, rock and pop musicians and a diversity of world and fusion musicians and many genres of jazz participate, usually about 50 artists annually. At the very first festival in 1991 were artists such as Jan Garbarek, Oscar Peterson, John Scofield, Pat Metheny, Manhattan Transfer, Dizzy Gillespie, Pharoah Sanders, Archie Shepp, John Zorn, Elvin Jones, Gilberto Gil, Miles Davis, George Benson, Carlos Santana, Charlie Haden, Elvin Jones and Joe Zawinul etc. The 2006 festival saw the likes of Michiel Borstlap, Madeleine Peyroux, Chick Corea, Richard Galliano, Candy Dulfer, the Neville Brothers, Herbie Hancock, Randy Newman