It's hard to believe she was only 77!
Hearing recordings of her singing in the 1950s and '60s, she already sounded like some ancient treasure rediscovered to bring strength and inspiration to our more modern times.
To realize now that she was only in her twenties when she had such a huge impact on "American" music, e.g. the young Bob Dylan, and just turning thirty when she sang at the 1963 march on Washington where Martin Luther King Jr. gave his "I Have a Dream" speech, is breathttaking. I didn't know that then, and am amazed to discover it now, only on news of her death.