... King Oliver. The most influential musician nurtured in New Orleans was King Oliver's second trumpeter, Louis Armstrong. The first true virtuoso soloist of jazz, Armstrong was a dazzling improviser. He changed the format of jazz by bringing the soloist to the forefront, and in his recording groups, the Hot Five and the Hot Seven, he demonstrated that jazz improvisation could go far beyond simply ornamenting the melody. He also set standards for all later jazz singers, not only by the way he altered the words and melodies of songs but also by scat singing (vocally improvising without words). Many New Orleans musicians, including Armstrong, migrated to Chicago, influencing local musicians and stimulating the evolution of the Chicago style. This style emphasized soloists and usually produced tenser rhythms and more complicated textures. Instrumentalists working in Chicago or influenced by the Chicago style included trombonist Jack Teagarden, banjoist Eddie Condon, drummer Gene Krupa, ...

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