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» From "You have to know theory @Create music" // October 24, 2007 5:08:20 PM UTC
It depends on what your idea of a musician or a songwriter is.
A large percentage of youth simply pick up a guitar or other easily accessible instrument and form bands that require nothing more than sub dominant knowledge of how to arrange or play songs. For the most part, people don't really tell the difference, though in my opinion it's extremely noticable and to gain respect as a musician knowing what your playing is crucial rather than trying to explain yourself via "Oh, uh, I just put my finger here and I put together these chords and..."
Theory is quite simple and it helps when writing, though like I said it depends on what you want to use it for.