Sources:

https://www.pbs.org/wgbh/americanexperience/features/eleanor-anderson/

https://www.smithsonianmag.com/smithsonian-institution/how-marian-anderson-became-iconic-symbol-equality-180972898/ - Alicia Ault

https://www.npr.org/2014/04/09/298760473/denied-a-stage-she-sang-for-a-nation - Susan Stamberg

Wikipedia

Ave Maria - https://www.youtube.com/watch?v=GksRp42s3S8&t=98s

My Country Tis of Thee - https://www.youtube.com/watch?v=mAONYTMf2pk

He's Got the Whole World in His Hands - https://www.youtube.com/watch?v=MRGZrv0Hl6k

https://www.nytimes.com/2021/01/15/books/review/the-essential-octavia-butler.html

https://web.mit.edu/m-i-t/articles/butler_talk_index.html

https://www.bbc.com/culture/article/20200317-why-octavia-e-butlers-novels-are-so-relevant-today

https://www.newyorker.com/books/second-read/octavia-butlers-prescient-vision-of-a-zealot-elected-to-make-america-great-again