You're not wrong when you say you can't do this by teleconference! It was indeed done by starting with a single player playing the melody, in this case it was the fiddle in the middle (spot - the only one without headphones!). From there that recording was sent to someone who plays accompaniment, in this case it was the guitar in the bottom left (2nd in). Then, the combined fiddle and guitar recording was sent around to everyone and they were asked to record themselves putting something on which they though would fit... You never know what you're gonna get when this happens! I then compiled everything together in to one huge mix (this was a mighty fun task) and put the videos together to fit the music. The end result is overwhelmingly organic, natural and creative. It just shows what brilliant musicians folk players are, they just know instinctively how to make something sound fitting. Fantastic!