C-sharp major/minor and D-flat major/minor are essentially the same keys using the same pitches but can be named either way.
Click on the chord symbol for a diagram and explanation of each chord type:
C♯ | C♯m | C♯sus2 | C♯sus4 | C♯maj7 | C♯m7 | C♯7 | C♯dim7 | C♯m7♭5
D♭ | D♭m | D♭sus2 | D♭sus4 | D♭maj7 | D♭m7 | D♭7 | D♭dim7 | D♭m7♭5
Chord Symbol: C♯ or C♯maj
The C♯ major triad consists of a root (C♯), third (E♯), and fifth (G♯). The distance between the root and the third is a major third interval (or four half-steps), and the distance between the third and the fifth is a minor third interval (or three half-steps). Major triads have a “happy” sound.
Chord Symbol: D♭ or D♭maj
The D♭ major triad consists of a root (D♭), third (F), and fifth (A♭). The distance between the root and the third is a major third interval (or four half-steps), and the distance between the third and the fifth is a minor third interval (or three half-steps). Major triads have a “happy” sound.
Chord Symbol: C♯m
The C♯ minor triad consists of a root (C♯), third (E), and fifth (G♯). The distance between the root and the third is a minor third interval (or three half-steps), and the distance between the third and the fifth is a major third interval (or four half-steps). Minor triads have a “sad” sound.
Chord Symbol: D♭m
The D♭ minor triad consists of a root (D♭), third (F♭), and fifth (A♭). The distance between the root and the third is a minor third interval (or three half-steps), and the distance between the third and the fifth is a major third interval (or four half-steps). Minor triads have a “sad” sound.
Chord Symbol: C♯sus2
In the C♯sus2 chord, the third of the C♯ major or minor chord (E♯ or E) is replaced (“suspended”) with the second note (D♯) of the C♯ major scale.
Chord Symbol: D♭sus2
In the D♭sus2 chord, the third (F or F♭) of the D♭ major or minor chord is replaced (“suspended”) with the second note (E♭) of the D♭ major scale.
Chord Symbol: C♯sus4
In the C♯sus4 chord, the third of the C♯ major or minor chord (E♯ or E) is replaced (“suspended”) with the fourth note (F♯) of the C♯ major scale.
Chord Symbol: D♭sus2
In the D♭sus4 chord, the third (F or F♭) of the D♭ major or minor chord is replaced (“suspended”) with the fourth note (G♭) of the D♭ major scale.
Chord Symbol: C♯maj7 or C♯Δ7
A major 7 chord is a major triad with an added seventh. The distance between the root and the seventh is a major 7th interval.
Chord Symbol: D♭maj7 or D♭Δ7
A major 7 chord is a major triad with an added seventh. The distance between the root and the seventh is a major 7th interval.
Chord Symbol: C♯m7
A minor 7 chord is a minor triad with an added seventh. The distance between the root and the seventh is a minor 7th interval.
Chord Symbol: D♭m7
A minor 7 chord is a minor triad with an added seventh. The distance between the root and the seventh is a minor 7th interval.
Chord Symbol: C♯7
A dominant 7th chord is a major triad with an added seventh, where the distance between the root and the seventh is a minor 7th interval.
You can also think of dominant 7th chords as being built on the fifth note of a major scale and following that scale’s key signature. For example, C♯7 is built on C♯, the fifth note of F-sharp major, and follows F-sharp major’s key signature (F♯, C♯, G♯, D♯, A♯, E♯).
Chord Symbol: D♭7
A dominant 7th chord is a major triad with an added seventh, where the distance between the root and the seventh is a minor 7th interval.
You can also think of dominant 7th chords as being built on the fifth note of a major scale and following that scale’s key signature. For example, D♭7 is built on D♭, the fifth note of G-flat major, and follows G-flat major’s key signature (B♭, E♭, A♭, D♭, G♭, C♭).
Chord Symbol: C♯dim7
A diminished 7th chord is a four-note-chord where each note is a minor third apart. You can think of diminished 7th chords as a “stack of minor thirds.”
Chord Symbol: D♭dim7
A diminished 7th chord is a four-note-chord where each note is a minor third apart. You can think of diminished 7th chords as a “stack of minor thirds.”
Chord Symbol: C♯m7♭5
The half-diminished chord is also called the “minor seven flat five” chord. It is a minor 7th chord where the fifth is lowered by a half-step.
Chord Symbol: D♭m7♭5
The half-diminished chord is also called the “minor seven flat five” chord. It is a minor 7th chord where the fifth is lowered by a half-step.
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