Old sheet music, with its great patina and history, makes great craft material. This round up of book page and sheet music Christmas craft ideas will give you plenty of inspiration! (not correct link, and couldn't find.
BOOK CRAFT / WALL ART :: Tons of INSPIRATION for Book Page (& Sheet Music) Wall Art :: how to Mod Podge a canvas w/ book pages. Try adding in scrap book paper, turning the pages, adding a monogram, bows or objects, using various shades of antiqued pages