Just a note about the ABC site. There are (free) programs to convert ABC files to standard notation and to MIDI files, so ABC is not limited to its own notation.

In order to get reasonable quality in printing/viewing sheet music you need some software. You should install "ghostscript" for the Postscript files and/or "Acrobat reader" for the "pdf" files. Both of these programs are free and have been compiled for Mac and Windows.

Another site you can look at is:

http://members.xoom.com/chrissawer/mutopia/ which is "Project Mutopia". It is hoped that this will be to music what "Project Gutenberg" is to literature. The last time I looked there was mostly classical music on the site; but it is open to all contributors, and there might be a wider range now.

Murray