Motown blew the music industry wide open with its sound: blending gospel and blues into catchy songs you couldn't help but play again and again. As the civil rights movement progressed and anti-Vietnam protests continued, many lent their voices to the cause to help turn the tide. This photo essay is a great look at some of Motown's most influential artists performing during the golden years of the label, before they could imagine how their sound would change the history of music, the…