Keith Richards once said the writer has a blank page, the painter, the blank canvas, and he as the musician has silence as his palette. Michelangelo said he saw the angel in the stone and set it free…
You only quoted others but did not answer the question with your original opinion ;)) (jk) !
I believe because we need to express ourselves in different ways.
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I like tacos
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My bad 
As for me, music isn’t just the way to express, it’s an opportunity to get away with imagination and sometimes it makes me see things from the other perspective with an illusive feeling of unity with nature. And it makes me feel complete.
@Pengus very informative, mate 