Kevin Solecki, a Grammy-nominated accordionist who owns Carnegie Accordion, sells his own brand of the instrument and plays some of the most renowned brands. Solecki also offers private lessons.

LOS ANGELES ― Across the street from a wine lounge and a gourmet sausage spot in the Atwater Village neighborhood of Los Angeles, a small red-and-white neon sign reads: “DAVE’S ACCORDION SCHOOL.” ...

When polka music made its mainstream debut in the Midwest in the mid-20th century, it was a hit among young crowds. Today, those crowds and accordion players at polka events (like those hosted ...