A friend has created a live365 Internet radio station, Gregorian Chant Lives! At the moment all but one of the tracks are from commercial recordings. One track is a Communion chant (link to pdf download: Amen dico vobis) sung by Harmonia Vocal Quartet and recorded during Mass under somewhat imperfect conditions.
The goal is to shift to chant recordings submitted by U.S. scholas. So if you’re a member of such a group and have mp3s to share, please e-mail.
In the meantime, enjoy listening.