The reason I have not replied yet is that you are asking specifically about free music. The editions of traditional, Greek mandolin music I have made are published by a "composers' collective" —a Greek (myself), an Italian, and a Spaniard— and the rights to them are therefore collectively owned.
The purpose of all sales is to finance further research in Mediterranean traditional/folk music for the mandolin (e.g. for purchases of vintage LP's, sheet music, etc.) While nobody is getting rich this way (ha, ha), I am not at liberty to circulate free copies. At the same time, I do not wish to make my replies in the non-Classifieds area of the board one continuous, perpetual, and annoying sales-pitch. I am sure we see this eye-to-eye.
Best of luck in your quest.
(The Greek Geek # )
It is not man who lives, but his work. (Ioannis Kapodistrias)