How to correct this sentence I have took them boys to denver colorado several times

After first arriving in new york, charlie parker took a job as a dishwasher at jimmy's chicken shack, where played the piano nightly. listening to his astonishing harmonic restructuring, virtuoso phrasing, and breakneck tempos every night for three months, charlie parker challenged himself to adopt these qualities into his playing, and he continued to practice tirelessly.

Examine the piece above. what is the subject matter in this piece? what is the content?

In a paragraph of no less than 125 words, explain the single most important factor involved in advancing american classical music in the twentieth century.