Hi, and thank you! I try to be as helpful as I can.
There is a download of that Communion jam session and, as a matter of fact, I’ve already posted it right here.
For anyone who is unaware of what she’s asking about, Ben Lovett of Mumford & Sons, Ben Howard and his band, Michael Kiwanuka, The Staves, and Johannes from Bear’s Den covered John Martyn’s “Over The Hill” during this year’s SXSW and shared the video of the jam session. I highly encourage you to not only check out that cover, but to also check out all of those brilliant artists and Communion. You can sign up to receive Communion’s weekly update that always includes free downloads and, really, who doesn’t like free awesome music? Check it out!