30 rivalries(out of which, one, Album vs. Single, is a cartoon strip). Some were brilliant, few were bad, one or two were outright stupid.
Jay-Z vs. Nas, Guided by Voices vs. Pavement, Radiohead vs. Coldplay, Lennon vs. McCartney, MJ vs. Prince were good. Led Zep vs. Black Sabbath and Blur vs. Oasis were the best, balanced, informative and interesting viewpoint in a historical perspective.
Bob Dylan vs. Bob Marley was an outright stupidity. There is no comparison. Both were spokesmen, but of different people, different societies.