What are the differences between a trumpet and trombone?

What is the central idea in this excerpt from act iii of romeo and juliet?

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.

Which lines from the weary blues suggest that the speaker is impressed by the musician?