So lilypond is a really geek-friendly project to produce music notation from text-based files. It has its own cryptic language. I spent a half day playing with it, so I'm not an expert at all, but I achieved something. ;-)
The example song I wanted to describe is the cantina band from starwars.
To make the long story short, here is the asciidoc source, the Makefile, and the result.