Violinist Vilde Frang shows she can do everything

There's a sweet spot for young artists after they've started to be recognized but before they've gotten really famous. Actually, the sweet spot is for audiences who get to hear them in intimate venues rather than the big halls they'll play in when they make the big time. It's a spot the Washington Performing Arts Society has been able to hit, time and again, thanks to the exigencies of programming -- lots of young artists start to make their reputations long in advance of their debuts in a given...