Derek Sivers recounts an inspiring story of how he got a multi-year music education in a few days from Kimo Williams, and makes a larger point about the excitement of learning at a fast pace with a good teacher:
After a one-minute welcome, we were sitting at the piano, analyzing the sheet music for a jazz standard. He was quickly explaining the chords based on the diatonic scale. How the dissonance of the tri-tone in the 5-chord with the flat-7 is what makes it want to resolve to the 1. Within a minute, I was already being quizzed, "If the 5-chord with the flat-7 has that tritone, then so does another flat-7 chord. Which one?"
"Uh… the flat-2 chord?"
"Right! So that's a substitute chord. Any flat-7 chord can always be substituted with the other flat-7 that shares the same tritone. So reharmonize all the chords you can in this chart. Go."
The pace was intense, and I loved it. Finally, someone was challenging me – keeping me in over my head – encouraging and expecting me to pull myself up, quickly. I was learning so fast, it had the adrenaline of sports or a video game. A two-way game of catch, he tossed every fact back at me and made me prove I got it.
In our three-hour lesson that morning, he taught me a full semester of Berklee's harmony courses. In our next four lessons, he taught me the next four semesters of harmony and arranging requirements.