Carl Orff, Carmina Burana, O Fortuna (With Latin and English). Better performance without lyrics.
Joan Baez, There But For Fortune. The best rendition of a song written by Phil Ochs. Ochs' version.
I agree with this analysis of Ochs:
The short, triumphant, tragic career of Phil Ochs illustrates one of the harder lessons of American popular culture: that audiences are moved far more by mystery than by commitment. Of all the artists of the 1960s folk-music boom, only Bob Dylan understood that in his bones, and only Dylan became a superstar. Ochs, by contrast, was the bright class president of the Greenwich Village scene, reeling off powerful, didactic protest songs in an earnest tenor. He was direct and defiantly uncool, and it doomed him.