The 82-year-old author sang a few refrains in her widely-recognized husky voice at a New York City event on Friday.
After the African American song about a rainbow, she told her Manhattan audience that a library is like a rainbow in the clouds.
The Schomburg Center for Research in Black Culture officially announced it has acquired Angelou's personal papers. The center is part of the New York Public Library.
The author of "I Know Why the Caged Bird Sings" regaled the audience with stories of her childhood. She also talked about friendships with the likes of novelist James Baldwin and civil rights activist Malcolm X.