Those fiddle lessons must be really working, Will.

They are! I've been poring over the fiddle music of Newcastle/Gateshead fiddler James Hill - and a great deal of his stuff was written in F, A and Bb. Much of it is based on simple chord arpeggios interspersed with chromatic runs - and it works beautifully.

I remember when I first started playing jazz 40 years ago - the classic jazz keys: F, Bb, Eb, Ab - were incomprehensible at first. Then they started to make sense, and it was several years before I played a chord that wasn't barred...