Yes to Clarinet, No to Piano

My parents recently retired. Mom always wanted to learn to play the piano, so dad bought her a piano for her birthday. A few weeks later, I asked how she was doing with it. "Oh, we returned the piano." said My Dad, "I persuaded her to switch to a clarinet instead."

 

"How come?" I asked. "Because," he answered, "with a clarinet, she can't sing."