CD 6 has all four members of Planxty singing 'Down in the Valley', recorded for and left off the first Planxty album, years before 'O Brother'! yes, Liam O'Flynn can sing!
this box set is well worth having, available from Christy's web site at a reasonable price and FREE shipping and handling. He gets the proceeds directly too, so better than Amazon. Planxty Live 2004 also available this way, FREE shipping