Make Flycheck syntax-check LilyPond files.
With use-package
in your init file:
(use-package flycheck
:ensure t
:defer t
:hook (LilyPond-mode . flycheck-mode))
(use-package flycheck-lilypond
:ensure t)
Or manually from MELPA with M-x package-refresh-contents and M-x package-install RET flycheck-lilypond, then you could have it loaded this way in your init file:
(add-hook 'LilyPond-mode-hook 'flycheck-mode)
(eval-after-load 'flycheck '(require 'flycheck-lilypond)
Just use Flycheck as usual in LilyPond mode.
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.
See COPYING
for details.