If music evokes emotion, then a series of musical numbers should evoke a series of emotional reactions. Laying out a set of emotional reactions to encapsulate that emotional arc should, then, be an exercise in picking music which establishes the right flow of responses and ensuring that the transitions between them are as seamless as possible, to carry the listener on the same journey that a book would.
I even have the next one's name.
[2.Ch.] Music as Ritual
@kelseyhusky @orrery oh dear that sounds really hot @.@