I was really sad to read the news of Miriam Makaba passing. She was a truly remarkable person. If you don't know about her, do yourself a favor and read this obit from the NY Times, then search out her music.
Miriam Makeba - New Times Obit.
I remember my oldest sister playing Miriam's album featuring "The Click Song" back as a teen in the '60's. It's a warm memory for me. But, also it was probably my first expose to world music. I could never figure out how she did that vocal. Check out the youtube clip.
The Click Song - Miriam Makeba
The power of her songs will live forever. May she rest in joyous peace.