When the woman starts to sing, you already recognize the melody. But wait, you're on the subway? The cast of The Lion King wanted to test how it would sound on the subway. They hopped on a train in New York and decided to sing. And see how the audience would react.
The artists start to sing the first tunes of The Circle of Life, while one of them starts to film. It was uploaded to YouTube. And yes, it sounds flawless. That's how I want to go home every day. A nice goosebumps moment, right?