The number of black slaves was less. The population as a whole of black slaves grew. A lot of the soil was bad from over-planting so there was less of a demand for slaves thus some would become free.<span />
Jelly Roll Morton was a brilliant solo pianist and also an prominent bandleader. He developed ragtime and instrumental blues into a new ensemble style which embraced collective polyphony, solo improvisations, and ever-changing textures and timbres.
Morton's piano style revolutionized jazz by adding sharp notes, flat notes, different sounding 5th and 6th of notes. He spread his influence by roaming around world and later by on recording. Jelly roll introduced new ways in jazz. He helped in showing the way to African American musicians and singers in recording industry.
Whereas, The Harlem Stride was a jazz piano style that emerged in large cities of the East Coast. It is regarded as the first step taken beyond ragtime that brought improvisation and rhythmic enjoyment to the living rooms, nightclubs and Harlem.
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It depends the goal of the argumentative paper. If you are arguing for a clear purpose use the expert testimony because of its credibility. Although if you are arguing and spitballing around about a topic then use your opinion about it.
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The answer is "Everyone at the company,including managers and employees"