How and why did chicago become a major jazz center? what was the typical band lineup for these classics jazz ensembles? who were the major artists? how did big band swing change the classic jazz formula?

    Origined between the late 1910s and early 1920s, the term "jazz" was used to denote a type of music that was born in places such as New York, Chicago, and New Orleans, where the pioneers and leading exponents of the genre emerged: the Original Dixieland Jass Band and the Original Creole Jazz Band. Especially in Chicago, the most important names were Louis Armstrong and Bix Beiderbecke, followed by New York musicians Fats Waller and Fletcher Henderson. From the year 1930 the genre was already prominent and with several great consolidated orchestras. These include Earl Hines, Count Basie, Duke Ellington, and Cab Calloway.

    Even in the 1930s, there was the emergence of a more popular aspect of jazz, called swing. It was a more dancing rhythm with immense acceptance at the time. From the year 1945 a jazz style called bebop emerges with a rhythm closer to popular taste, becoming radicalized from the 1950s, when it became the hard bop. Still in the 50's, the style featured names such as Bill Evans, Thelonious Monk, Gerry Mulligan, John Gilberto, Frank Sinatra, Art Blakey, Clifford Brown, Tom Jobim, Oscar Peterson and Charles Mingus. In detriment of the more aggressive sound of these two styles, comes the same period cool jazz, presenting a more intellectual proposal.

   In contrast to these less popular styles, one of the biggest names in jazz history was Glenn Miller, born in 1904. Miller was a swing-era bandleader and one of the highest-selling artists between 1939 and 1942, making popular music and leading one of the most important big bands of the period.

    In the 1960s, freejazz was created, created in the USA by musicians like John Coltrane and Rashied Ali. With its origin in bebop, it offered improvisation and musical freedom to the instrumentalists. Among other mergers, one of the most notable was the fusion of jazz with rock'n'roll. There is currently room for several genres of jazz. These ranges from dixieland to freejazz experimentalism, to the most ambitious standards and compositions.

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