Gsharp
Gsharp is a graphical, interactive score editing application for standard Music notation. It can be customized by dynamically loading new Lisp code. The Gsharp user interface is based on CLIM. Source code, documentation and sample output are available at the project site.

ASDF-install package (obsolete) http://common-lisp.net/project/gsharp/gsharp-20070120.tar.gz