abc-mode
An Emacs major mode for editing ABC music files.
It supports:
- Editing ABC music files.
- Generating Postscript output (through external tools, such as abcm2ps).
- Generating MIDI output (for example, abcMIDI).
Emacs Org Mode support is described at http://orgmode.org/worg/org-contrib/babel/languages/ob-doc-abc.html. The source file is at ob-abc.el.
Much more information can be found at Guido Gonzato’s abcplus page.