Musicals as an art form have a unique problem. For musical fans, it merely falls under Willing Suspension of Disbelief. For those who dislike musicals, it tends to at least superficially be the reason why. As we all know, music needs to be composed in advance. Rhyming poetry takes time to piece together. People don't just burst into song and dance in the middle of the street to express their feelings. So how do you make sense of a work of fiction where they do? Examples of Musical World Hypotheses include: