LGTM, with one suggestion: the difference between unpure and pure functions in LilyPond is that unpure functions accept n arguments whereas pure functions accept n+2. This shortcut you're proposing only works when n=1, which you document, but it'd be nice if it worked for an arbitrary number of input arguments. It'd only be possible to do this, though, if there were a way in C++ to determine the number of arguments a Scheme function took.
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