"C# Major" (or the key of C#) is a major scale based on C#, with the pitches, all sharps C# D# ES F# G# A#. Its key signature has seven sharps: F# C# G# D# A# E# B#. Its Relative Minor scale is A# Minor. Its Parallel Minor is C# Minor, and its enharmonic equivalent is Db minor. C# is a somewhat easy key and scale to memorize as all the note are sharp.

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 C# Major, the primary chords are: C#, F#, G# and G#7. From the primary and secondary chords of a major key, countless songs and chords progressions can be played.

Harmonic Analysis is the understanding of the functional sequence of chords. It is the process used to analyze the harmonic structure of a progression, song or composition. This analysis is then used to make scale selections for improvisation and chord substitution.