属于 "stretch-backports" 发行版 tex 子版面的软件包

lilypond (2.19.81+really-2.18.2-13~bpo9+1)
program for typesetting sheet music
lilypond-data (2.19.81+really-2.18.2-13~bpo9+1)
LilyPond music typesetter (data files)