If you read my postings, you would know that what I have to say about that makes a lot of people very angry. If I'd have to give one characteristic of "great music", I would say that it holds the interest of an intelligent adult no matter how many times he or she listens to it. It always has something new and interesting to offer. Sometimes it is its sheer beauty of sound, sometimes it is how it is constructed like the architecture of a building, sometimes it is the way it progresses and how one part leads powerfully into another, sometimes it is the way the musicians play together making the whole much greater than the sum of the parts. It takes a great mind which has either a unique bent for music and has been highly trained to write such music or even rarer, utter genius like Mozart who was writing from early childhood. It also takes musicians who have dedicated their lives to the perfection of their instruments or their voices both technically and musically. These are very rare combinations but when found can be savored like great wines, great art, or great literature. They are the exact opposite of the mundane, mediocre, ordinary, carelessly written and performed so called music which is commercially so successful. And why does it make people angry to hear that what most of them call music is mediocre trash? Because deep down they know that it is one hundred percent true. That's why.