From The Corner House, by The Irish Tradition, after much peer urging. I have learned this using a new (for me) G/Am scale: E, G, and d on the left push; F#, A, and e on the left draw; B, f#, and a on the right draw; and c, g, and b on the right push. Actually the only new thing in there for me is the use of the right hand B/c instead of the left hand c/B, but whoa, it’s a doozy.