Choral Public Domain Library

Is anyone familiar with these sites? They have a number of scores by Renaissance composers (which look to be of good quality) that I do not see on CPDL.

http://www.artlevine.com/15_16th_century.aspx
http://www.philomela.net/

Hope this isn't too late for you - - The Library of Congress lists a bunch, including choral and song settings by Babbitt, Barber ("God's Grandeur" and "Heaven-Haven") Britten ("A.M.D.G."), Krenek, Mathias, Pinkham, Rubbra, as well as other less-known composers, along w...