The ‘happiest’ sounding of the modes, the Ionian is identical to the major scale, so it’s highly likely you’re already playing it on guitar ... E and A in the key of A major.

This is used when writing a melody. Each key signature has two possible keys. The major key and the minor key, which will begin on a different note. This is known as the relative minor.

One guitar is playing a I IV V progression using ... This would be a bVI chord, which is not part of the major key of D major. This borrowed chord creates a feeling of tension before going back ...