If you want to play the Howl's Moving Castle theme on accordion you first need to play on the right hand D, G, B flat, D or G minor and on the left hand you press the C minor then go D 7 and G minor. Then it goes C minor, F and B flat. Next play D minor, E minor, A7, D minor, then C, B flat and A 7. B flat to A 7 is a pretty large jump so you may need to practice. So again you repeat C minor, D7 and G minor. Then C minor, F and Flat. Next play D minor, E minor, A7, D minor, C, B flat and then A 7. The middle part goes B flat, C and then F and then you repeat this. Now go up to G minor, A 7 , D minor, C and B flat then A 7. Now repeat this and take it from the beginning. Now you can easily play Howl's Moving Castle on accordion!