Lyp – The Lilypond Swiss Army Knife - https://news.ycombinator.com/item?id=13259590 - Dec 2016 (7 comments)
LilyBin, an Online Musical Score Editor (using LilyPond) - https://news.ycombinator.com/item?id=9414004 - April 2015 (1 comment)
Obsessed with putting ink on paper or What's wrong with computer music notation? - https://news.ycombinator.com/item?id=1515262 - July 2010 (36 comments)
Open source typesetter for sheet music - https://news.ycombinator.com/item?id=1192289 - March 2010 (23 comments)
LilyPond architecture (music notation software in Lisp) - https://news.ycombinator.com/item?id=379234 - Nov 2008 (2 comments)