Nelson Mandela, one of the most recognizable symbols of the defense of human rights of the twentieth century.

Tenzin Gyatso is the 14th Dalai Lama. He won the Nobel Peace Prize in 1989, and is also known for his lifelong advocacy for Tibetans inside and outside Tibet.

Presley was a baritone with a multi-toned voice. It covered 2.3 octaves, with the middle octave being most ideal. His voice reminded many of rhythm and blues and gospel singers.