Fix ob-lilypond.el compiler error: org-babel-tangle undefined function

lisp/ob-lilypond.el

@@ -30,6 +30,7 @@
 ;;; Code:
 (require 'ob)
 (require 'ob-eval)
+(require 'ob-tangle) ;;compiler requesting fun org-babel-tangle
 (defalias 'lilypond-mode 'LilyPond-mode)
 
 (declare-function show-all "outline" ())