Also, the instruments that are used often include elements that do not feature a definite pitch. ... Plus, Armstrong's voice became an important solo instrument in his works. ... Together, the voice and instrument become interchangeable and equal, especially in early, New Orleans jazz. ... Finally, this music made the piano, drums, and bass important solo instruments, as in Bebop, all instruments played an equal role. ... Rock is built upon the blues vocal style, combined with the popular music percussion established by Big Band and Bebop. ...

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