Originally Posted by: wreckensexplainations to noob?
lol i dont understand wats this =O

Basically this theory shows the relationship of notes between the Root Major scale and the Fifth note of the Root when you start the Major scale intervals at the fifth note going in the direction of #'s.
Example: Starting @ C. The fifth note of C Major is G, which is the dominant note of C Major. They share all of the same notes but one. When you start the Major scale intervals with G, the F note from C Major has to be sharpened (raised 1/2 step) to F# by following suit. So G Major has one # note compared to C Major. The Fifth note of G Major is D, which has two #'s compared to C Major and so on.
Going in the direction of b#'s starting @ C again, the forth note of C Major is F (starting with the direction of b's is known as the circle of forths), which is the sub-dominant note of C Major. They share all of the same notes but one as well. One note needs to be flattened (lowered 1/2 step). The B note from C Major needs to be flattened to Bb.
Looking at the notes of F Major you will notice that C is the fifth note.
Take the notes needed to make a G7 chord (known as a dominant 7th) and see how they relate to C Major.
Try C7 and how it's related to F Major and so on.