While I was playing “Carol of the Bells” on piano in public, a 9-year-old girl joined me with her violin. We had never practiced together — but as soon as she began playing, the energy changed. It ...

I was playing Carol of the Bells on piano when a 9-year-old girl came up with her violin and asked if she could join. We had never played together before, but she started in perfect harmony — and the ...