What makes great art? What great art have I experienced? Ask yourself. Pick a work.
Great Art: something made that significantly moves the mind and heart.
As my mind and heart is different to yours, great art to me will be different than to you.
Many may say (a friend, critic, academic, institution, cultural norm) that a piece of music written by a well known composer is excellent. It may not be if it fails to move my mind and heart…