/usr/bin/lilypond is in lilypond 2.18.2-12build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh
export LD_LIBRARY_PATH="/usr/lib/x86_64-linux-gnu/lilypond/2.18.2/guile"
exec "/usr/bin/lilypond.real" "$@"
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