Starting Out On Hayden Duet, Advice? in Teaching and Learning Posted November 28, 2007 Regards fingering I favour "flexible fingering"; and will state catagoricly that there is no "correct fingering" for the Hayden system concertina! My little fingers I use very flexibly on the RHS for the leading notes, and for chromatic decorations, and usually find that I am using ti IV (up) do I, re II, fa III, which fits the RH very comfortably, but might also use do II, & re III, then mi IV, up to Fa I, So II, La III. On the LHS I use my little finger almost entirely for Bass notes around an octave below my other fingers which may be playing counter melody or chords. I have trained it to go right across even under Left I. Inventor.