Maya Angelou, former dancer, wrote a poem about it:

I Know Why The Caged Bird Sings

The free bird leaps on the back of the wind and floats downstream till the current ends and dips his wings in the orange sun rays and dares to claim the sky. But a bird that stalks down his narrow cage can seldom see through his bars of rage his wings are clipped and his feet are tied so he opens his throat to sing. The caged bird sings with fearful trill of the things unknown but longed for still and his tune is heard on the distant hill for the caged bird sings of freedom The free bird thinks of another breeze and the trade winds soft through the sighing trees and the fat worms waiting on a dawn-bright lawn and he names the sky his own.

But a caged bird stands on the grave of dreams his shadow shouts on a nightmare scream his wings are clipped and his feet are tied so he opens his throat to sing

The caged bird sings with a fearful trill of things unknown but longed for still and his tune is heard on the distant hill for the caged bird sings of freedom.

Maya Angelou