Actually, the piano arrangement was very interesting - using rising and falling versions of the same harmonic phrase around the repetitions of the main melodic line.

Nowt wrong wi' that, as we used to say in my native Lancashire. One man's meat, etc...

If you think you don't get that sort of stuff in folkie-type music, have a listen to some of the wonderfully outrageous solos that Richard Thompson gets away with so brilliantly!