Wow, this is turning into so much more of an ordeal than I thought.
I just spent the last couple of hours investigating whether there was an easier way to convert the original raster images (in Photoshop PSD format) or the PDF into an SVG image -- apparently there's a way to do it via Illustrator (I have the full Adobe Design Studio CS6). I hadn't installed Illustrator yet, so I did that, and have been trying to figure out how to get that conversion done -- it's weird, because I'm not used to Illustrator.
I just don't know if I can be bothered to go through all this, just for this little ditty -- I don't even "have" to add this in to my ebook at all, actually, I just thought it might be fun.
For what it's worth, here's one of the two images that I'd put together for the sheet music (which is two pages long). I'd put it on "old paper", just for the heck of it, to go along with the 19th century flavour of the book as a whole.
I also downloaded that MuseScore proggie that was mentioned before, and started transcribing the sheet music note-for-note -- also a total pain in the butt to do (I got a bar-and-a-half into it before I put it aside and started looking into the Illustrator route instead).
Do y'all not think that for me to just include the images like I originally did up (as you see here) wouldn't be good enough? I was going to do them up as full-page images, and if one's device supports zooming in, then you could do so, of course.