“Glenn Dicterow, the concertmaster of the New York Philharmonic, has joined an illustrious club: prominent musicians who forgot their instruments in taxis. In Mr. Dicterow’s case, it was a 1727 Guarneri del Gesù violin belonging to the orchestra. But his separation anxiety lasted barely 30 minutes because of a lucky set of connections that sent the taxi driver zooming back in time for a concert curtain.”