Before 1925, recordings were made with an acoustic horn which captured the sound of the musicians in front of it and transferred the vibration to a cutting stylus. No electricity was used. This process was called the acoustic process. In 1925, microphones were introduced to transfer acoustic energy to an electrical signal that powered the cutting pen. This electrical process improved the sound of recordings.2-Armstrong transformed jazz performance away from collective improvisation. Thanks to his incredible performances, jazz has become a solo art form. Armstrong created the model for modern swing rhythm. Additionally, he infused the tone of the blues into his improvisations, which ensured that the blues would become part of jazz. He was also the first to record scat singing.3- The Chicago style was played by white musicians from affluent, middle-class neighborhoods. The New Orleans style, on the contrary, was played by blacks and Creoles from poor and discriminated areas. It is rooted in New Orleans style with significant changes. In Chicago style, the sa...