“A bird doesn't sing because it has an answer, it sings because it has a song”

— Maya Angelou

Although it appears on U.S. postage featuring Angelou, this is actually a variant quote from the work of poet Joan Walsh Anglund.
Misattributed
Source: Postal Service releases Maya Angelou stamp with quote from another author, Josh Hicks, 7 April 2015, Washington Post, 9 April 2015 http://www.washingtonpost.com/blogs/federal-eye/wp/2015/04/07/postal-serves-releases-maya-angelou-stamp-with-quote-from-another-author/,

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Maya Angelou 247

American author and poet 1928–2014

Joan Walsh Anglund (1926) American poet and children's book author

The quote has been misattributed to Maya Angelou at times, including on U.S. postage.
This quote by Joan Walsh Anglund (1967 in her book, A Cup of Sun) has been widely used by Maya Angelou without attribution to Walsh Walsh Anglund, and wrongly misattributed to Maya Angelou many, many times, including on U.S. postage. However, the quote belongs to Joan Walsh Anglund, and is from her book "A Cup of Sun" published in 1967. However, Maya Angelou changed the pronoun "He" to "It" but quoted everything else of Joan Walsh Anglund. Why Maya Angelou never attributed her most famous quote as being Joan Walsh Anglund's is still a mystery to this day.
Source: A Cup of Sun: A Book of Poems (1967)

“The whales do not sing because they have an answer. They sing because they have a song.”

Gregory Colbert (1960) Canadian photographer

Ashes and Snow : A Novel in Letters (2005) Flying Elephants Press

“Because when he sings… even the birds stop to listen.”

Suzanne Collins The Hunger Games

Source: The Hunger Games

“I would like to say to you, to the leaders of the left, and the leaders of the right, I sing… I sing for everyone. My song has no flag, my song has no party.”

Leonard Cohen (1934–2016) Canadian poet and singer-songwriter

Introducing "Who by Fire"
Warsaw concert (1985)
Context: I come from a country where we do not have the same struggles as you have. I respect your struggles. And it may surprise you, but I respect both sides of this struggle. It seems to be that in Europe there needs to be a left foot and a right foot to move forward. I wish that both feet move forward and the body moves towards its proper destiny. This is an intense country; the people are heroic, the spirit is independent. It is a difficult country to govern, it needs a strong government and a strong union. … I would like to say to you, to the leaders of the left, and the leaders of the right, I sing... I sing for everyone. My song has no flag, my song has no party. And I say the prayer, that we said in our synagogue, I say it for the leader of your union and the leader of your party. May the Lord put a spirit, a wisdom and understanding into the hearts of your leaders and into the hearts of all their counsellors.

“The ocean has been singing to me, and the song is that of our life together…”

Nicholas Sparks book Message in a Bottle

Source: Message in a Bottle

“I think my great book is Born to Sing: An Interpretation and World Survey of Bird Song.”

Charles Hartshorne (1897–2000) Philosopher

In Herbert F. Vetter, " Not The Average Philosopher http://www.harvardsquarelibrary.org/unitarians/hartshorne.html", Harvard Magazine, May/June 1997, Volume 99, Number 5. Vetter was surprised by this, given Hartshorne's dozens of substantial books on theology.