So... how do you explain all these musical numbers?
- Alternate Universe Hypothesis: Spontaneous Choreography is the norm. Just roll with it.
- All in Their Heads Hypothesis: It's Thinking Out Loud (or a Distant Duet) in song form.
- Diegetic Hypothesis: It's a straight performance unambiguously given in the real world.
- Adaptation Hypothesis: The Literary Agent Hypothesis is at play here; it's clearly not meant to be a straight depiction of what happened.
- Visit unabridged version here