C#mmaj7addb9 Minor-Major 7th
The C#mmaj7addb9 chord is built from the notes C# – E – G# – B# – D.
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Chord tones, one by one
C#Root
Root
The fundamental note the chord is built on — C#.
EThird
Minor third
Three semitones — makes the chord minor (darker, sadder).
G#Fifth
Perfect fifth
Seven semitones — the most stable interval, reinforces the root.
B#Seventh
Major seventh
Eleven semitones — a lush, jazzy seventh just below the octave (maj7).
DExtension
Flat ninth (♭9)
A ♭9 — sharp, dissonant tension typical of altered dominant chords.
🎼 Related scales
🎹 Modal analysis
This chord implies the Neapolitan major scale; its characteristic note is the ♭9 / ♭2.
🎸 Genres
Classical · Cinematic · Tango