To Dave:
I think there was a Roger Watson tutor for the Anglo years ago, to go with the books on English and melodeon. Also John Kirkpatrick tells me he's working on an Anglo tutorial video for Mrs. Casey Music.

Personally I play mostly chords to accompany songs on Anglo. Too much melody adds nothing and can get in the way of the words. Harmonies can be pretty, though. F is a good key for me to sing in, and sits quite nicely on a C/G; Andy Turner uses is a lot as well. In fact, I used to accompany "The Little Piecer" in the key of F, now I come to think of it - I played the melody as an intro, but the rest of the accompaniment was just simple, sustained chords: less is more with a song like that.

I don't agree with Dick; a visit to www.concertina.net and use of their search engine will tell you all kinds of things about song accompaniments, Peter Bellamy, and anything else you might want to know. Sure you get the occasional pedant and trouble maker, but there are one or two of them on any forum, not excluding Mudcat.

I do agree with Dick about leaving out the thirds in chords.

Peter Bellamy used drones a lot, and had little clamps fitted so his thumb didn't get tired. Along with the drones he would play bits of melody and bits of chords, which would often set off interesting dissonances against the drones and create an eerie feel (e.g. "My Boy Jack").