Quote:
INSTRUCTIONS FOR THE SALVATION ARMY CONCERTINA
The main key of the SA Concertina is Ab Concert Pitch, that being the key in which most of our tunes are sung. But as this key is the same as Bb on the Cornet, and seeing that our concertinas are mostly played with brass bands, we call it the Bb key, although it is really Ab Concert Pitch.
( Source: Intro from the SA Tutor by "HHB" this being the not particularly favourite son of the General )
Who said concertinas were easy?