(Short Essay) Who is The "GOAT" in The World Music?

As we know, GOAT is "the Greatest Of All Time" or "Best Of The Best". It can be in any field... sport, movie, book, philosophy, music, etc. I'm personally not sure who the first person introduced this term was, but it can be easily found every where nowadays, especially on internet. It seems that the term of GOAT can be very subjective. But, of course it can be objective too if that term was delivered based on specific data or reliable source. In this short essay of mine, I'd like to write something about the GOAT in music.