i play in many keys, in the band repertoire
on the c accordion they would be
C
G
F
A [really A7 - the band plays in A
but of course my 3rd and 7th are flatted,
a very bluesy key]
A minor
D minor
G minor
E minor

and most of them on both C and Bflat accordion

and some on G, Bflat or F rows of my 3 rows

so it makes for a lot of key variation

then i'm playing zydeco, it;s not quite
as stuck on the first and second positions
as cajun

wle.