Just ran onto this.. http://www.oldmusicproject.com/...it's new to me, though some may have seen it, as it has been up for several years.

It has many, many tunes in ABC, MIDI, PDF and Noteworthy formats, including O'Carolan and madrigals, as well as fiddle tunes.

The only problem is, he says it may disappear this Summer because of costs.

It is a wonderful resource, and he is seeking ideas and/or funding....