“One of the persistent threads running through Finnissy’s output has been a fascination with popular music and folk song. Folklore, a massive solo-piano work in four “chapters”, is Finnissy’s exploration of how that interest has been assimilated into his style. The second part is half-an-hour long, with fragments of folk material from around the globe embedded in highly figured keyboard writing. It’s elusive music, and the other folk-based pieces are useful primers for the greater sophistication and subtlety of the larger works.