An Irish man, Ken Hopkins, was known as “the accordion man” — a moniker that reflected his status among squeezebox aficionados. That’s because his life was defined by the instrument — as a player, collector and repairman. At the time of his death last year, he had the largest-known private collection of accordions. Now, his children have brought those instruments to the auction block. Hosts Carolyn Beeler and Marco Werman explain.