Hiya Fidjit , lovely to see you're giving it " Rock - all " and thankyou again for all your advice for music and sessions in Oslo which were very well directed .
I write on your comments about not being able to sing and play the concertina at the same time.
My memory fails but there was a chap who played concertina some years ago , who had a terrible, terrible, stammer,(even whilst doing his introductions) , then, when he played and sang - magnificently - showed no trace of the problem.
The Wilson Family will tell me his name - a really pleasant and good performer.
Whilst I was over in Oslo a group which contained both a talented concertina (the Geordie lad) and a good fiddle player a Norwegian lass seemed to cancel each other out - a bit like two people singing in unison, but , back to the question, the guitar can compliment the concertina , whistle or whatever, provided the guitarist knows the tune. Simply to strum does not constitute accompianment - but everyone has to learn and strumming must be seen as a stepping stone and don't get stuck on the same 3 or 4 chords .

Cheers

Betsy