"I can sing," said Margo. (Claire was sniffling and rubbing her knee.) "We sing all the time in music class at school. Listen to this. It's the song about the smart reindeer: Rudolph the Red knows rain, dear." "Margo," I said when she had finished. I paused to think. Margo was giggling away at her reindeer joke, but there was a little problem. She couldn't carry a tune. She might have been singing any song. Any song at all."