Hakeem Henderson was barely old enough to walk when he began carrying around a blue toy microphone. It was clear even then what his future career would be. In September, the 26-year-old Baltimorean ...

While I was playing piano in a train station, an incredible opera singer suddenly joined in — and her voice echoed through the hall, stunning everyone around. This spontaneous performance turned a ...

I was playing piano in a cozy French restaurant when something amazing happened. An opera singer stood up and began to sing — and moments later, a choir joined in. The entire room filled with music ...