CodeMirror.defineMode("lilypond", function() {
  return {
    token: function(stream) {
      // Highlight Comments
      if (stream.match(/%.*$/)) {
        return "comment";
      }
      // Highlight LilyPond commands (e.g., \relative, \time, \key)
      if (stream.match(/\\[a-zA-Z]+/)) {
        return "keyword";
      }
      // Move to the next character
      stream.next();
      return null;
    }
  };
});