A vocalist and a dancer are much the same.
A great solo vocalist has the power to make you feel, listen, and take you through the story by any means necessary. In a live setting, we connect with our ears and our eyes.
A great vocalist can make you remember "the first song at the first show.
A great vocalist can help a collective crowd shake a foundation or shudder with a ripple.

A great solo dancer is much like a great vocalist
They just don't need a microphone, but give them one and they will dance on it.