The period from the end of the First World War until the start of the Depression in 1929 is known as the "Jazz Age". Jazz had become popular music in America, although older generations considered the music immoral and threatening to cultural values. Dances such as the Charleston and the Black Bottom were very popular during the period, and jazz bands typically consisted of seven to twelve musicians. Important orchestras in New York were led by Fletcher Henderson, Paul Whiteman and Duke Ellington. Many New Orleans jazzmen had moved to Chicago during the late 1910s in search of employment; among others, the New Orleans Rhythm Kings, King Oliver's Creole Jazz Band and Jelly Roll Morton recorded in the city. However, Chicago's importance as a center of jazz music started to diminish toward th