The composer and the date it was composed or how old is it.
Is there a special story about the song?
Who has the most famous playing or singing of it?
Illustrate the song or make a slide show to the music using photos.
Mac - iMovie tutorial will do this.
You can also do this with Hyperstudio, Kid Pix Studio Deluxe and Storybook Weaver software (Use their clip art not photos).
Photo Story 3 - free download from Microsoft that lets you easily create narrated "mini-movies" using photographs. It has a built in music generator that allows you to put your story to music, copyright free. Tutorial
Pics4Learning - copyright friendly images for use in education projects
Software
tutorials - Photoshop, Pagemaker, Dreamweaver
& more
LearningElectric - on demand tutorials that build skills