Questions on Jazz Listening

Why is jazz great?       Is jazz listening hard to learn?     I already love jazz. What's here for me?
I already know my favorite types of music, and I'm busy. Why should I bother with jazz?
Why should I have to "learn?" Shouldn't the musician play something I can like without any effort?
Why "explain" art? Doesn't it stand on it's own merits?          Is it really necessary to study jazz listening?
Has listening to jazz ever been taught before now?         How do I know when I'm listening correctly?

Questions on Listening in General

Why is listening so important?          Is listening ever taught formally?