Just released the SubLilyPond package (http://www.github.com/yrammos/SubLilyPond, a comprehensive syntax highlighter for GNU Lilypond code in Sublime Text 2. LilyPond (http://www.lilypond.org) is a state-of-the-art text-based system for music typesetting.
In future versions of SubLilyPond I may add a LilyPond build engine and snippets/autcompletions. Feel free to contact me for feedback, bug reports, and feature suggestions.
Music scholars seeking a complete typesetting solution may be interested in LyTeXTools (http://www.github.com/yrammos/LyTeXTools), my LilyPond-enabled fork of Marciano Siniscalchi’s LaTeXTools package.