Thanks, Brian — nobody has ever used the concept of competence in connection with my inept [or anyhow not·all·that·ept] Anglo-playing before. It's just that the melody comes naturally to my left hand rather than my right - I have no idea why. I see it is a bit like playing the air on the piano on the bass keys, but that's just the way my fingers fall. I don't play all that much melody anyhow, mainly accompany harmonically — but inter-verse riffs & breaks &c just happen to trip easier off my LH than my RH fingers.