Install denemo by entering the following commands in the terminal:
sudo apt update sudo apt install denemo
Description:
GTK+ front end to GNU Lilypond
GNU Denemo is a GUI musical score editor written in C/GTK+. It is intended primarily as a front end to GNU Lilypond, but is adaptable to other computer-music-related purposes as well.
Homepage: http://www.denemo.org
Version: 2.2.0-1build1
Section: universe/sound