I wish there was some kind of hack to get it to validate, despite that <audio> code. I know that I can convert it from EPUB2 to EPUB3, but that's a pain to do, makes making any changes difficult (because I do all my editing in Sigil, as EPUB2, and then I'd have to re-convert to 3 each time), not to mention there are compatibility limitations with 3, of course.
I may just scrap it, I suppose -- but it's such a shame, because for those readers that can play audio files, it's so nice to actually hear the music that I'm including sheet music for in my book (as per another thread I started on here).
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