Convert AZW3 Sheet Music to usable format

I'm trying to find a way to convert sheet music in AZW3 format to PDF or some format that will allow me to write notes on the file. The problem is that the music itself seems to be an embedded image. I have tried converting to PDF, RTF, and HTML. When I print the image it is blurry. This may just be a problem at the source rather than something that can be overcome. I just wondered if anyone has found a solution.

Thanks for the help.