Musicals are, by nature, theatrical, meaning poetic, meaning having to move the audience's imagination and create a suspension of disbelief, by which I mean there's no fourth wall.
Stephen SondheimSometimes I'll ask the book writer to write a monologue, not to be performed, just as if they were notes for the character.
Stephen SondheimTODD: The history of the world, my love -- LOVETT: Save a lot of graves, Do a lot of relatives favors! TODD: Is those below serving those up above! LOVETT: Ev'rybody shaves, So there should be plenty of flavors! TODD: How gratifying for once to know BOTH: That those above will serve those down below!
Stephen Sondheim