Yes Brian is quite right about useful information, to be got from C net. I guess ive just run into two or three of the minority, Who like to pontificate and split hairs .Forewarned is forearmed. what I find about the English Concertinaas against say the Duet, Where its relatively easy to play melody and full chordal accompaniment,is that it forces you to be imaginative with your accompaniments, of course I do use melody and accompaniment, But am using chords, harmony lines etc more and more.experimenting with different inversions creating two note suspensions and then resolving them,with this style you can make mistakes and it can lead you to discovering something interesting chordally.when you play straight melody its obvious when you make a mistake and nothing is gained.In my tutor,I have given examples of different ways to treat a particular song.Most of the songs are in relatively easy keys Amajor. G maj. Dmaj F maj B flat maj. Cmaj. if they dont suit your vioce you can always transpose them.Dick Miles