six nine chord generator
Build and Listen to Six Nine Chords
A six-nine chord adds a major sixth and major ninth to a major triad without a seventh. C6/9 contains C, E, G, A and D. The slash separates two additions; it does not name a bass note as it would in C/E.
Play C6/9 and compare Cmaj9. The reference replaces B with A while keeping C, E, G and D. Select F6/9 and verify F, A, C, D and G; listen to D to identify the sixth.
Play the instrument ↑- Chord formula
- 1 · 3 · 5 · 6 · 9
- Semitone offsets
- 0 · 4 · 7 · 9 · 14
- C reference
- C · E · G · A · D
- Sound
- Sine reference · A4 = 440 Hz
Six and nine with no seventh
A six-nine chord adds a major sixth and major ninth to a major triad without a seventh. C6/9 contains C, E, G, A and D. The slash separates two additions; it does not name a bass note as it would in C/E.
C6/9 is not C13 because it has no seventh or eleventh. The selected-bass label is shown separately below the symbol when an inversion is chosen. The symbol 6/9 itself never instructs the tool to put D in the bass.
- Degree 1 is 0 semitones above the root in this reference.
- Degree 3 is 4 semitones above the root in this reference.
- Degree 5 is 7 semitones above the root in this reference.
- Degree 6 is 9 semitones above the root in this reference.
- Degree 9 is 14 semitones above the root in this reference.
A listening test for 6/9
Play C6/9 and compare Cmaj9. The reference replaces B with A while keeping C, E, G and D. Select F6/9 and verify F, A, C, D and G; listen to D to identify the sixth.
The Compare major ninth button retains your chosen root and octave and plays the comparison in root position. Set the current chord to root position for a direct comparison. The note buttons let you isolate the chord member that makes this quality different.
Follow the selected bass through each voicing
This 5-tone reference offers 5 positions. Root position starts with degree 1; First inversion starts with degree 3; Second inversion starts with degree 5; Third inversion starts with degree 6; Fourth inversion starts with degree 9. The bass suffix beneath the chord symbol identifies the actual lowest tone.
Root position preserves compound ninths, elevenths and thirteenths at their original height. The inversion selector first moves the extensions into one octave, sorts by sounding pitch and rotates from the selected degree. These close pitch-class study voicings are different from the complete extended root-position stack; they are not recommended jazz fingerings.
A six-nine chord can provide a major tonic color without a major-seventh interval. Use the contrast button to decide whether your arrangement calls for the sixth A or seventh B over C, then export the exact displayed reference.
Check C, F and A before transposing further
Begin with C and confirm C · E · G · A · D. Use the F and A example buttons to transpose the same interval collection. Follow the MIDI values if an enharmonic spelling looks unfamiliar: changing the root shifts every sounding note by the same interval.
Use Root octave 2 for a lower reference or octave 5 for a higher one. A root change keeps your selected voicing; the example buttons return to root position. Reset restores C, octave 3 and root position. Stop sound ends the currently active chord or arpeggio.
What playback and the WAV file contain
The displayed notes are synthesized locally using sine waves after your click. The tool does not create a progression, transcribe a song, provide guitar fingering or simulate an acoustic instrument. No camera, microphone, registration or file upload is needed.
Download WAV saves the currently displayed voicing as a 2.4-second mono PCM file at 44.1 kHz with a short fade. It does not export the comparison chord or an arpeggiated performance. If Web Audio is unavailable, the note display and WAV download remain usable.
Theoretical note names preserve each degree and may use double accidentals. Equal-tempered playback gives enharmonic notes the same frequency. This browser tool does not add new extended-chord gestures to the webcam instrument; that instrument has its own triad, inversion and seventh controls.
Play the separate gesture instrument → · Local processing and privacy →
Answers before you play
Six Nine Chord Questions
What are the notes in C six nine?
C · E · G · A · D. The formula is 1 · 3 · 5 · 6 · 9, with semitone offsets 0, 4, 7, 9, 14. These are the complete notes sounded by this generator in root position.
How does this differ from major ninth?
Play C6/9 and compare Cmaj9. The reference replaces B with A while keeping C, E, G and D. Select F6/9 and verify F, A, C, D and G; listen to D to identify the sixth.
Are these standard performance voicings?
A six-nine chord can provide a major tonic color without a major-seventh interval. Use the contrast button to decide whether your arrangement calls for the sixth A or seventh B over C, then export the exact displayed reference. The tool states its complete formula and uses close pitch-class rotations for inversion study. Performance omissions and spacing depend on the instrument and musical context.
Can I play and export without a camera?
Yes. Click Play chord or Play arpeggio for local audio. Download WAV saves the displayed chord even if live audio is unavailable. Camera and microphone permission are never requested.
Why does the displayed accidental look unusual?
C6/9 is not C13 because it has no seventh or eleventh. The selected-bass label is shown separately below the symbol when an inversion is chosen. The symbol 6/9 itself never instructs the tool to put D in the bass. Note letters follow chord degrees; MIDI numbers show the actual pitches at A4 = 440 Hz.