(I almost skipped over this one by accident. Can you believe it?)
The difference, to me, between an opera (a through-composed form) and a musical (a song-structured form) is a rhythm of expectation. In an opera, at least post-Wagner, you don't have a sense of what musical material is going to come back when. If a motif, or a melody, recurs, it's always a pleasant surprise. On the other hand, when you're working within the context of song form, you can deliver on or subvert an audience's intuitions of what comes next. It's another way of playing them, almost physiologically.
I'm always looking, then, for new song forms- if you get trapped in AABA/ABABCB for a whole score, it takes on a homogeneity, but without a backbone, the audience loses its sense of gravity, as often happens late in megamusical-style through-sung pieces. Here's an incomplete list of alternative possibilities, some of which I've looked into and some of which I haven't:
- ABAC (As in "The Sun Shines On You", but also "Jade Rabbit (Mercy)", at least subcutaneously.)
- AAAA
- Sonata form: exposition, development, recapitulation (Resembles AABA, until you factor in that you're expositing two contrasting melodies.)
- ABA
- ABAB
- Rhapsody: no/very limited repetition
- Half-choruses
- Symphonic structure, mass structure, etc. (See Heather Christian's work.)
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