I hope this doesn't offend anyone. I am a Yankee using the English Concertina in country music and blues.
Lately, I have been using an English Concertina to play parts the fiddle would normally play.
http://curbsidejimmy.com/radio/Isle%20of%20Hope.mp3
I have a lot of work to do in this instrument. I plan on using it with music I know first.
Why the English System? I have owned one for years.