The Anglo concertina is also English (i.e. it comes from England). Its name
is short for Anglo-German concertina because it uses a layout system similar to
the German Chemnitzer Konzertina. It plays a different note when a button is
pressed and the bellows compressed than when the bellows are expanded. This
suck-blow operation is similar to a harmonica's. Irish traditional musicians use
the Anglo to play fast melodic reels and jigs (and they call it the Irish
concertina). Others (notably John Kirkpatrick) have explored a rich polyphonic
use of the instrument.
Anglos have two or three curved horizontal rows of buttons. Two of these rows play a diatonic scale, each in a particular key. These two keys are normally a fifth apart, for example G and D. The third row (where present) provides accidentals and notes needed to make more note combinations possible in each bellows direction.