choragus
noun
cho·ra·gus kə-ˈrā-gəs 
variants or choregus
kə-ˈrē-gəs
-ˈrā-
1
: the leader of a chorus or choir
broadly : the leader of any group or movement
2
: a leader of a dramatic chorus in ancient Greece
choragic
kə-ˈra-jik
adjective 
Word History
Etymology
Latin & Greek; Latin choragus, from Greek choragos, chorēgos, from choros chorus + agein to lead — more at agent
First Known Use
1625, in the meaning defined at sense 1