Mercedes Sosa – Wikipedia

Haydée Mercedes Sosa (Spanish pronunciation: [meɾˈseðes ˈsosa]; 9 July 1935 – 4 October 2009), sometimes known as La Negra (literally: ‘The Black One’), was an Argentine singer who was popular throughout Latin America and many countries outside the region. With her roots in Argentine folk music, Sosa became one of the preeminent exponents of La nueva canción.

https://en.wikipedia.org/wiki/Mercedes_Sosa