And accordion players can play bass lines and chords in any key with the same effort
Now when I strap on the accordion, I know how a pregnant woman feels
On the up side, the best keyboard players I know are from the accordion background. There are several reasons for this.. Accordion is taught, to learn theory, chords, technique, etc, all structured around circle of fifths (fourths).
Almost every accordion student that study, say 2 years, retained what they learned.. Compare to Piano students who studied even longer then 2 years... many can't play a single note
My wife took piano for 5 years as a kid... they must have done a lot of talking... she sure didn't learn anything..
Then there are the great piano players, I mean they can play exactly what is written in front of them .. Take the music away...game over. And few can ever retain in memory what to play. Call a chord change , and they think you are speaking another language.
Accordion Rules!!!!