Installing lilypond-mode in emacs

[David Sumbler]

I have just installed Ubuntu 16.04 to replace my previous 12.04 system,
and installed LilyPond v.2.19.40.

In my ~/.emacs file I already had

(autoload 'LilyPond-mode "lilypond-mode")
(setq auto-mode-alist (cons '("\\.ily$" . LilyPond-mode) auto-mode-alist))
(add-hook 'LilyPond-mode-hook (lambda () (turn-on-font-lock)))

This gave me lilypond-mode in emacs under Ubuntu 12.04, but it doesn't
work now.

I have looked at the instructions in section 4.2 of the Usage manual
and also in the lilypond-init.el file.  I commented out the above 3
lines and added

(setq load-path (append (list (expand-file-name 
"/usr/local/lilypond/usr/share/emacs/site-lisp")) load-path))

but I still don't get lilypond-mode in Emacs (v.24.5.1).

What have I done wrong?

David