What's a Major Scale?
A major scale is a scale containing a major third (3) and a major seventh (7). There must be four half-steps between the root and the major third and one half-step between the major seventh and the root. The most known is the major scale spelled 1 - 2 - 3 - 4 - 5 - 6 - 7.
What Are the Twelve Types of Major Scales?
When we think about major scales, the first that comes to mind is the Ionian mode, best know as THE major scale. However, there are several other types of major scales (Ionian #5, Lydian augmented #2, Ionian b6) which deserve a little more attention. Here they are listed with guitar shapes and formulas.