Identitune for Visually Impaired?

Just doodling wih ideas like I used to do with rocks and dirt when I was a kid, I am wondering what the aural version of identicon (identitune?) might be like and how it would be generated from random bits? It'll help visually impaired folks to distinguish large numbers but not necessarily text.
Turning a sharp corner, I think identitune could run amok copyrighted melodies. But I like the idea of assigning people, places, and things melodies of their own…