Aristotle's Definition of Tragedy

  imitation button action serious complete magnitude language embellished parts of the ply persons performing pity ad fear purification tragic acts  


χωρὶς ἑκάστῳ τῶν εἰδῶν ἐν τοῖς μορίοις /
several kinds being found in the parts of the play

Again, making the comparison with epic poetry, Aristotle observes that tragedies not only employ a variety of verse forms, but that the forms vary from one part of the drama to another; with particular variation between the dialogue to the choral odes.