Hi there. I grew up with my Mom being Lorraine Hayden, Chicago's 47th St Clubs
Concertina star.. About 14 concertinas, a fiddle electric bass and drumset
all told.
Most of the instruments had mics inside but they were horrible! For making the
albums, I liked a 57 at a distace of around six feet dead on center. This was a
while ago, tho, if they were till recording, I guess a 421 is a great bet. It
seems like the frequencies are like a harmonica, with a bit more bass.
Good Luck
Jer SUNdog Audio
Chicago