C Sharp Major Scale (C♯ Major Scale)
C♯ – D♯ – E♯ – F♯ – G♯ – A♯ – B♯ – C♯ are the notes of the C sharp major scale.
Notes of the C Sharp Major Scale on a piano keyboard and in ascending order on a staff:

C Sharp Major Key Signature
The key signature of C sharp major scale has 7 sharps: F♯, C♯, G♯, D♯, A♯, E♯ and B♯.
C sharp major scale is the relative major of A sharp minor scale. C sharp major and A sharp minor scales have the same sharp key signature.

C Sharp Major Diatonic Chords
These are the seven major scale diatonic chords that come from the C sharp major scale.

I. C♯ – E♯ – G♯ (C Sharp major chord)
ii. D♯ – F♯ – A♯ (D Sharp minor chord)
iii. E♯ – G♯ – B♯ (E Sharp minor chord) *Notice that E Sharp and F are enharmonic equivalents. F minor chord is the same as E Sharp minor chord.
IV. F♯ – A♯ – C♯ (F Sharp major chord)
V. G♯ – B♯ – D♯ (G Sharp major chord) *Notice that G Sharp and A Flat are enharmonic equivalents, and A Flat major chord is the same as G Sharp major chord.
vi. A♯ – C♯ – E♯ (A Sharp minor chord)
viiº. B♯ – D♯ – F♯ (B Sharp diminished chord) *Notice that B Sharp and C are enharmonic equivalents. C diminished chord is the same as B Sharp diminished chord.
These are the chords that are diatonic to the C sharp major scale. They make a harmonic sound for music in the same key.
Enharmonic Major Scales
C Sharp Major and D Flat Major Scales are enharmonic major scales. They have the same pitches but have different note names.
D Flat Major Scale (D♭ Major Scale)
D♭ – E♭ – F – G♭ – A♭ – B♭ – C – D♭ are the notes of the D flat major scale.
Notes of the D Flat Major Scale on a piano keyboard and in ascending order on a staff:

D Flat Major Key Signature
The key signature of D flat major scale has 5 flats: B♭, E♭, A♭, D♭ and G♭.
D flat major scale is the relative major of B flat minor scale. D flat major and B flat minor scales have the same flat key signature.

D Flat Major Diatonic Chords
These are the seven major scale diatonic chords that come from the D flat major scale.

I. D♭ – F – A♭ (D Flat major chord)
ii. E♭ – G♭ – B♭ (E Flat minor chord)
iii. F – A♭ – C (F minor chord)
IV. G♭ – B♭ – D♭ (G Flat major chord)
V. A♭ – C – E♭ (A Flat major chord)
vi. B♭ – D♭ – F (B Flat minor chord)
viiº. C – E♭ – G♭ (C diminished chord)
These are the chords that are diatonic to the D flat major scale. They make a harmonic sound for music in the same key.
Piano Chords and Scales Posters
These posters include the essential chord and scale diagrams for learning all major and minor chord sets — Piano Chords and Scales posters bundle (Set of 2) – Folded A1 Size Version
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