Source : Webster's Revised Unabridged Dictionary (1913)

Choragus \Cho*ra"gus\, n.; pl. {Choragi}. [L., fr. Gr. ?, ?; ?
   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.

Source : WordNet®

choragus
     n : (ancient Greece) leader of a group or festival; leader of a
         chorus
     [also: {choragi} (pl)]