'Theory According to Cal' is a 1 hour lesson. If you are a beginner or a fiddler that has been playing for a while, this lesson is for you. This lesson will help you develop your ear so you can recognize common sounds and licks in most every tune. Learn this simple approach and you're well on your way to learning more and more tunes, quicker. Calvin plays by ear and this has nothing to do with reading notes. You will also learn a couple of tunes as well.