Traditional key signatures provide a wealth of information that can enhance our understanding of music and its underlying principles.

"A Major" (or the key of A) is a major scale based on A, with the pitches A B C# D E F# G#. Its key signature has three sharps: F# C# G#. Its Relative Minor scale is F# Minor, Minor. Its Parallel Minor is A Minor.

Major and Minor Harmonized Chord Charts are used for while doing a Harmonic Analysis (HA). Shows triads and 4-part chords for ALL 15 major and minor keys. "Yes, Virginia there are 15 keys."

The primary chords for any major key are the I, IV and V chords of its corresponding major scale. For A Major, the primary chords are: A, D, E and E7. From the primary and secondary chords of a major key, countless songs and chords progressions can be played.

The secondary chords for any major key are the II, III and VI chords of its corresponding major scale. For A Major the secondary chords are: Bm, C#m and F#m.

Common chord progressions for the key of A. Using the primary and seconday chords for the key explore these common chord progressions for the key of A.

Basic and Quick Change blues chord progressions in the key of A major using the core 7th chords from the Big Six series of lessons. This is great way to explore this core chord in various keys.