The document discusses several dramatic devices used in plays:
1. An aside allows a character to address the audience directly while remaining unheard by other characters on stage. It differs from a monologue or soliloquy.
2. A play within a play involves a play being performed by characters within the larger play, often with symbolic or psychological significance.
3. Songs in plays can serve expositional, conflict-narrating, narrational, emotional climax, and summarizing functions in addition to entertainment. They help develop the total dramatic effect.