system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 The piano-looking keys are obvious, but what do all those other buttons on the side of an accordion do?
gpt
Each button plays a chord (a combination of notes that sound good together). Like when you strum all of the strings on a guitar.

So you can play the main tune with the piano looking keys, and give yourself some backing chords at the same time!