SlackBuildsOrg/misc/pmw

Philip's Music Writer, previously called Philip's Music Scribe, was
written by Philip Hazel as a simple way for people to create sheet
music on a computer running the Linux operating system.

pmw uses a special internal language to encode musical notation. Files
can be created and modified in any text editor. The pmw command-line
program translates the input text file into an output postscript file
of music manuscript, using a special "alphabet" of symbols. A user
manual in PDF format is provided as part of the package.

An archived homepage can be viewed here:
https://web.archive.org/web/20190331211148/http://people.ds.cam.ac.uk/ph10/pmw.html