Choruses of men were dressed in goatskins to represent satyrs--beings who were half man and half goat, attending Dionysus. Tragedy gets its name from the costumes and recitations of the chorus--tragos (goat) and ode (song).
At the Greater Dionysian festival three contests were held for dramatists. One was in comedy, one in tragedy, and one in the dithyramb (an elaborate choral ode sung by a chorus of 50 singers).
Plays were funded by the polis, and always presented in competition with other plays, and were voted either the first, second, or third place. Tragedies almost exclusively dealt with stories from the mythic past. Comedies almost exclusively with contemporary figures and problems.
From the contests came some of the world's greatest dramatists. Little is known of them, and only a few plays survive. Those that remain are magnificent.