The only thing I know about jazz is that you can't make jazz hands without it. Fortunately, my total cluelessness on the subject didn't stop me from enjoying the New York Jazzharmonic's performance at the Washington Square Music Festival last night. The only piece I recognized was the finale of Sing, Sing, Sing (I bet you'll know it too) and it was an electric finish to an epic set. My favorite part was when special guest JP Jofre pulled out the skinniest, sultriest-sounding accordion ever (it's actually something called a bandoneon). As Jofre explained, the keys make different sounds whether you pull or push the sides, resulting in an instrument so difficult to play that it's no wonder the Germans invented the thing and then promptly shipped it off to Argentina.