What you are asking about already exists, "Folk Music On Recordings". It is no where near complete, and is mostly LPs, rather than CDs, but this project is such a monumental task, that I am sure that in time it will cover just about anything you want to know. It is noticably better than when I first found it. Just go there and start exploring!

http://milton.mse.jhu.edu:8001/research/folkindex/maindex.htm