What Greek mathematician came up with the idea of the octave and first focused on the pleasing sounds that some notes make together

Ben is preparing an essay on the history of art. ben complete the sentence to describe an important development in the history of christian art by ad 1400, a center for christian art. after the protestant reformation began, the catholic church directed artists to specifically promote the values of the 1) a. rome 1) b. venice 1) c. athens 2) a. protestant 2) b. roman catholic 2) c. greek and roman