The two helicopters crashed in Rio de Janeiro on Sunday, killing at least six people, the authorities said. More

When the medical technology company Abbott developed mixed-reality games, it got one of the world’s great orchestras to record the soundtracks. More

Stephen Sondheim’s masterpiece, “Sunday in the Park With George,” contains a song capable of making order out of mayhem. Listen to hear how he did it. More

Jack White makes his slide guitar scream, Sylvan Esso rocks out and 7 more new tracks to know. More

A federal judge had ordered the center to remove the president’s name by Friday. As the clock struck midnight, workers were resting on scaffolding. More