What jazz composer-arranger was known for his extended compositions (those that went beyond the usual 3-minutes)? duke ellington louis armstrong benny goodman scott joplin?

Ellington recorded for most American record organizations of his time, performed in a few movies, scored a few, and made a bunch out of stage musicals.

Explanation:

Ellington was noted for his innovative utilization of the symphony, or huge band, and for his expert articulation and charisma.

This period is known as the swing time, alluding to the lilting swing move rhythms utilized by the Big Bands.

Benny Goodman promoted the music for white crowds. Other persuasive bandleaders were Cab Calloway and Count Basie.

i believe their role is to instruct certain sections on when they are to join and when they are to stop