Q: My 10-year-old started music lessons as a toddler and has been playing the piano for the past few years. She has (or, rather, was taught to have) a good ear for music. We expect 20 minutes of ...

As a professional pianist, Mariana Koval is used to performing for large crowds inside regal concert halls. But it turns out that her most loyal audience lives in her home — and they insist on playing ...