/usr/bin/abc2ly
/usr/bin/convert-ly
/usr/bin/etf2ly
/usr/bin/lilymidi
/usr/bin/lilypond-book
/usr/bin/lilypond
/usr/bin/lilypond-invoke-editor
/usr/bin/lilysong
/usr/bin/midi2ly
/usr/bin/musicxml2ly
You may install this package on Debian with
apt-get
install lilypond