Bob Marley is one of the greatest musicians of all-time. Modern reggae music wouldn't be what it is today without arguably its founding father, and unquestionably the most famous artist in the genre ever. Marley's music was "rebel" music, Jamaican rock that was not only jamming but had a pointed message lyrically.
Bob Marley represented change, spearheaded revolution and charged up protests with his songs. Social justice was a constant focus of his lyrics, and he's still associated with fighting the power decades after his death. His legend will live on forever, not just as a musician, but as an agent of progress.