/usr/share/lilypond/2.14.2/vim/ftdetect/lilypond.vim is in lilypond-data 2.14.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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" Installed As: vim/ftdetect/lilypond.vim
"
au! BufNewFile,BufRead *.ly,*.ily set ft=lilypond
|