I know why the caged bird sings

I know why the caged bird sings, ah me,
When his wing is bruised and his bosom sore,
When he beats his bars and would be free;
It is not a carol of joy or glee,
But a prayer that he sends from his heart's deep core,
But a plea, that upward to Heaven he flings –
I know why the caged bird sings


I am impressed by this poem. I saw this book in one of the Reba Mcentire's music video. Its on a song called "Is there life out there". This song was composed after her entire band crew died in a place accident. In this song, she prepares very hard (after being a mom for 2) for a college paper and types bunch of papers over 3 weeks and her kids pours coffee on those papers. That time she says "She does not need any more accidents in her life". Towards the end of video, her teacher appreciates the paper and gives her A and says jokingly says to avoid stain on her paper the next time. She says "I learnt a lot from the stain than from her paper". Its nice.