Dirk wrote:
I inherited a concertina from my grandpa. It is quite old, but what amazes me is how difficult it is to play. I can play most instruments with ease, but this instrument has really got me scratching my head. The notes are not like any other instrument (From low to high), everything is extremely random and what makes it worse is that in and out is different notes
The term you're looking for is "bisonoric" ? If you think of accordions then generally piano accordions (with the keyboard) are not bisonoric and
proper button accordions are.
I doubt it's random, you just haven't twigged the pattern yet.
Wikipedia's entry may help you make sense of the instrument...
http://en.wikipedia.org/wiki/Concertina