Okay! I actually managed to get the entire 2 pages of sheet music converted to SVG format (with each measure as a separate file, so I now have 9 separate SVG files), but I really feel stupid because I'm clueless as to what to do with them now. I took at the wiki here on using SVG images...
https://wiki.mobileread.com/wiki/SVG
...but all it does is confuse me even more!
I also tried to upload one of my SVG images here, if only to see if you could tell me that I did them right, but when I try to upload it I get a message saying "Invalid File".
I don't know what the heck I'm doing, but I guess if I knew what code I'm supposed to use in order to insert these SVG images into my book, then I could at least test it out and see if it works or not -- I just don't understand what I'm supposed to do with them now, though.