Why is this system as played by the late,great, Sir Jimmy Shand not more popular. It is the natural progression for Irish BC &CC# players who would like the benefit of stradella (accordion)bass. Any 2 row player would be able to play their repertoire on 2 of the three rows in exactly the same way as on a two row box. The third row just makes matters a lot easier! giving much easier fingering & bellows direction over a greater range of keys.