1) Festival conductor 2) Leader 3) Leader of a group or festival 
leader of a choir or organizer of musical festivals
• (n.) A chorus leader; esp. one who provided at his own expense and under his own supervision one of the choruses for the musical contents at Athens.
in ancient Greek theatre, any wealthy Athenian citizen who paid the costs of theatrical productions at festivals during the 4th and 5th centuries . [3 related articles]
Cho·ra'gus noun ; plural Choragi . [ Latin , from Greek ..., ...; ... chorus + ... to lead.] (Gr. Antiq.) A chorus leader; esp. one who provided at his own expense and under his own supervision one of the choruses for the musical contents at Athens. 
Choragus was a name given by the Greeks to the leader or director of the choruses furnished for the public festivals, and who also defrayed the expenses of the chorus. The choragus who was adjudged to have performed his duty best received a tripod of brass, for which he had to build a monument, on which it was placed. A street in Athens which conta...
[n] - leader of a group or festival
noun (ancient Greece) leader of a group or festival; leader of a chorus
(in ancient Greece) · the leader of a dramatic chorus. · a person who undertook the expense of providing for such a chorus.