Leonard Slatkin: “So we finished on Tuesday night playing Bolero, and then on Wednesday, Tchaikovsky’s Fifth Symphony, and I simply turned to [the audience] and I said, ‘maybe some of you might enjoy sending greetings from sunny and warm Florida to all of you people suffering in the 11 degrees that it was at the time [in Detroit]. Why don’t you do something you haven’t heard before in the concert hall: turn on your phones now.”