Ok, I've been trying to figure out exactly what an O.C Session is for a few days now and I still have no friggin' clue. So I figured I'd just go ahead and ask the experts

From what little I know its something where 2 (or more?) artists callob on a project online through a website or program of some sort. . .

Can someone please help me and point me to a website on an O.C Session?

Thank you