Yep, Fact is you don't need to learn music theory or how to read music to play an instrument and create music. Just ask, the masses of hit makers from the beginning of time. If reading music and learning theory was the only factors to music success, only the greatest songwriters and musicians who know how to read music and know music theory would be the hit makers, and all others would never have a hit song. That's a logical fact. Here's a theoretical idology. There are millions of musicians who do not know music theory or read music, and they have never had a famous hit song. And that's because they don't know how to read music, and have never learned music theory. As for Billy Sheehan. Than man has a perfectionist mentality, and the hardest work ethic anyone could ever achieve. He is fast and technical because he works hard to get to that level and continues to work just as hard to maintain it.