It's a very unfriendly tune for the 10-hole diatonic harmonica, unlike the vast majority of, say, Irish tunes. It uses both missing notes in the bottom octave (still one missing even with Paddy Richter tuning) and it has that damned C natural in the B part that you can't get by bending. Hence my tasteless habit of harmonising like crazy. Our landlord loves it and he's the man with the beer, so...