"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.

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.

The secondary chords for any major key are the II, III and VI chords of its corresponding major scale. For C# Major, the secondary chords are: D#m, E#m and A#m. From the primary and secondary chords of a major key, countless songs and chords progressions can be played.