John, I would like to vote for ABC. It does seem to be the closest thing to a "universal language" that can be posted across different platforms. It has pretty much all of the information of sheet music, although I wouldn't like to sight read from it.

It is a bit tedious writing them though. I think Alan's (of Australia) program will produce an ABC file from a MIDI. I don't know how it handles multiple voices.

If you find something with a particular nice harmony that you would like to share, it is best to post it, say, using Alan's program; but not expect it to find its way to the database. I see the database as a source of information, rather than entertainment. I would only want to see the harmony in it when it was necessary to understand, or appreciate the particular piece. For most folk songs, I would rather just be given the chord patterns in a CRD file like OLGA and Cowpie use (as well as the melody in a MIDI).

Murray