Before 1925 recordings were made with an acoustic horn that captured the sound of the musicians in front of it and transferred the vibration to a sharp 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, which powered the cutting stylus. This electrical process improved the sound of the recordings. 2-Armstrong transformed jazz performance away from collective improvisation. Thanks to his incredible performances, jazz has evolved into a solo art form. Armstrong created the blue print for the modern swing rhythm. Furthermore, he infused the tonality of the blues into his improvisations, ensuring that the blues became a part of jazz. He was also the first to record scat singing.3- The Chicago style was played by white musicians from comfortable middle-class neighborhoods. The New Orleans style, on the other hand, was played by blacks and Creoles from poor and discriminated areas. It is rooted in the New Orleans style with major changes. Chicago style, the sa...