The role of the guitar has nothing to do with anything. From the blues, RNB, rock 'n' roll, Chuck Berry, etc spawned the creation of rock because people liked the way it sounded and so the commercialism grew. Others' copied and decided to take the rock elements and strand it into a wider variety of music, but obviously still encompassing rock because of the instruments. Rock = guitar/bass/drums/vocals. It's just a formula that worked. It wasn't "based" around guitars, per say, it was just a combination of instruments working together for the audiences interest.
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