Through the tubular walkways of Paris' metro stands a forty-something man with a grey beard. He is swinging in rhythm with his accordion, which he plays above his open accordion chest. Inside are low value euro coins and a sign with the gentleman's name, email address and this one word description: Amateur. Despite the description, and as far as accordions are concerned, the guy was damn good. It got me to thinking about some of the persistent differences between Americans and Europ...