I actually kinda got the idea from some classical composers' songs ("lieder"). If you listen to, say, Schubert's or Schumann's lieder they don't repeat very often, have weak beats, often they have no refrain or choruses and so on. But I was thinking to take that a step further. Plus maybe add some melodic or harmonic rules, as I said. Maybe something like, no major chords, or only major chords, or something.
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