Question: The 1927 musical "Show Boat" Features a character, Steve, who acts as a substititute for what feature of Ancient Greek plays, typically consisting of 12-50 players?
Sentence (from "Ol' Man River"): The song is meant to be performed in a slow tempo, it is sung complete once in the musical's lengthy first scene by the stevedore "Joe" who travels with the boat, and, in the stage version, is heard four more times in brief reprises. Joe serves as a sort of musical one-man Greek chorus, and the song, when reprised, comments on the action, as if saying, "This has happened, but the river keeps rolling on anyway."
Relevant evidence: Yes