I know why caged bird sings_Maya Angelou

A free bird leaps on the back　　　　　　
Of the wind and floats downstream 　　　 　　
Till the current ends and dips his wing 　　　
In the orange suns 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 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.　　　　　　
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.