Answer:
In tonal music, chord progressions have the function of establishing or contradicting a tonality, the technical name for what is commonly understood as the "key" of a song or piece. Chord progressions are usually expressed by Roman numerals in Classical music theory. For example, the common chord progression I–vi–ii–V.
Explanation:
Conductors help the musicians count and when to change volume. Also they help the musicians come in at the right time or to stop
The last bit would be Broadway
