New Orleans jazz was and remains the most influential form of roots jazz. The major underpinnings of the style were in place by 1900 or a bit before, when New Orleans, Louisiana produced musicians like Buddy Bolden, Jelly Roll Morton and Kid Ory. The most distinctive characteristic of New Orleans jazz is the influence of the marching brass bands. The first recordings of the genre were by the Original Dixieland Jass Band from 1917. The 1920s saw trumpet and cornet leaders like Louis Armstrong and Joe "King" Oliver, playing with the trumpet proclaiming the melody and harmonies and countermelodies coming from the clarinet or trombone. The rhythm section typically included a tuba or bass, piano, banjo or drums. During this period, ensembles were standard, in contrast to many of the later developments in jazz. By the 1930s, however, newer forms of pop-jazz like swing music and Dixieland had overtaken authentic New Orleans-style jazz among mainstream audiences.