I am self taught in Music Theory. I did go to school and was taught all kinds of theories for many years. Some of it is useless. I took what I needed from school and used common sense in applying it to what I wanted to play. I passed my tests and got my certificates, that say I am qualified to do different things in music, however music itself teaches you theory. If you can read music, you can learn a lot from just reading it.
Music Theory is the flunk out course for many institutions of higher learning. That course has destroyed more lives than any other course I can think of, except maybe anatomy for pre-med students. They always have to test you with something to see how bad you want the degree.
Music Theory has helped me and hurt me in many ways. I wish my ear was as strong as my theory skills are. My ear is good but, it is not as good as I would like for it to be.
The rumors about Wolfgang Mozarts prodigeous tonal memory are legend.
One story was he went to an opera and heard the music and went home and wrote it out by memory. Several hours worth of music were retained in his head and he reproduced it.
I am not a big fan of his music though. Its runny and its silly. He writes scale passages and chords that use the divided and subdivided beat too much for my taste. He does not come across as serious enough for my tastes. I saw the movie Amadeus and got a picture of the man and his music. I realize Hollywood has to distort reality, so I take it as not being totally accurate.
He wrote some Masses. All the classical composers did, but he didn't write anything of real lasting value in the serious religious catalog. He was a Mason. But I don't know his religious affiliation. He was dead at 29. That's not much time. I have lived almost double his years.
I still prefer Johann Bach and his Lutheran Church Job. He was a church musician his entire life, and he experimented with many theoretical techniques. Thanks to him we have the present system of tuning. Bach was busy making babies and working with music. He was very prolific and fruitful. Bach lived a long life. I need about 20 more years to catch him. I only have one son, so I can forget about catching him with the off-spring.
brother scott