I do believe the "BASSMAN" nailed it down with those suggestions. Iry Lejeune, Amedee Ardoin, and Nathan Abshire. LOL, some of the hardest to play along with accordion players in history! But if you can play along with them tit for tat, then you're probably one of the best accordion players walking the earth today...LOL second to me of course.
Don't stop there, delve into Aldus Roger, Austin Pitre, Joe Falcon, Amede Breaux, Blind Uncle Gaspard "Rabbit Stole the Pumpkin", Angelas Lejeune if you're feeling brave enough. And last, but not least, when you're done with all these old players, take a stab at following Clifton Cheniere with the "C" accordion, or play his style in what ever key you can swing his style in. Clifton will teach you how to put your soul into your got dam accordion playing and singing.