Is the chemical aftertaste the reason why people eat hot dogs, or is it some kind of bonus?
I wouldn't be able to write a song like 'Someone Like You' and get someone else to sing it because it's so personal. It's like giving away your heart.
In discussing the process with the actors, I made it clear to them that they could improvise but that the sum total of their improvisation needed to impart certain plot points, and schematic material.