C Sharp Harmonic Minor Piano Scale
The key of C sharp minor and E major are related and share the same key signature of 4 sharps, F sharp, C sharp, G sharp and D sharp. C sharp minor is known as the relative minor of E major; E major is known as the relative major of C sharp minor.
C sharp is the 6th note of the E major scale. The 6th degree of any major scale is always the note which represents the related minor key.
As the keys of E major and C sharp minor are related to each other, they both share the same key signature of 4 sharps. Therefore the scale of C sharp minor, in its most basic, natural form, will share exactly the same notes as E major but rather than beginning and ending on E (E major) will begin and end on C sharp (C sharp minor).
E major: E F# G# A B C# D# E
C sharp natural minor: C# D# E F# G# A B C#
To change the natural C sharp minor scale into the harmonic C sharp minor scale
Take the notes from the natural C sharp minor scale and raise the 7th degree, B, by one semitone or half step to B sharp. There will still be 4 sharps, F#, C#, G# and D#, in the key signature but now B sharp will appear as an accidental on the music staff.
C Sharp Harmonic Minor Scale:
C sharp D sharp E F sharp G sharp A B sharp C sharp