\applyMusic was the music function ancestor: you could apply a unary function to a single music expression. So it is sort of useless now, unless I'm missing something.
As long as all old useful examples that use the \applyMusic feature are not rewritten into music functions, it may certainly be useful for some people. On the other hand, keeping \applyMusic in the implementation but removing it from the documentation may be a good way to phase it out.
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