Watch Lin-Manuel Miranda, Andrew Lloyd Webber in charity piano play-off

Composers in isolation are taking their chops to Twitter with the idea of raising dough for furloughed Broadway workers. Musical megastar Andrew Lloyd Webber started the trend Thursday, playing the show-stopping “All I Ask of You” from his “Phantom of the Opera” musical. The cooped-up Twitterati were ticked by Webber’s tinkling of the ivories. “I...