> I know I can run lilypond on song.ly and it will implicitly wrap it in > a \score block, but is that contained in an intermediate file somewhere > I can get access to?
No, there is no such file. The implicit wrapping happens at the level of LilyPond's data structures, it's not a textual macro expansion. It would be better for ly2video not to modify the input file. Normally, you'd spell out the \unfoldRepeats and stuff in the input file directly.
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