C♯ Minor 6/9

Notes: C♯ – E – G♯ – A♯ – D♯
Degrees: 1 – ♭3 – 5 – 6 – 9

Also written: C♯m6/9, C♯m69, C♯min6/9, C♯-6/9, C♯m6(add9)

The C♯ Minor 6/9 chord is a five-note chord made up of C♯, E, G♯, A♯, and D♯.

C♯ Minor 6/9 chord: C♯, E, G♯, A♯, D♯

It is built from a root, minor third, perfect fifth, major sixth, and major ninth.

Also written: C♯m6/9, C♯m69, C♯min6/9, C♯-6/9, C♯m6(add9)

Maintained by Justin Evans, a pianist of 25 years.

How this entry was built

The notes, intervals, degrees and fingerings come from one stored spelling per entry, read by the site’s theory kernel. Nothing on this page is typed out entry by entry, which is why sibling keys agree with each other: they are the same arithmetic applied to a different root. What a person adds is the part arithmetic cannot settle, which is whether the spelling itself is the one a musician would write.

Whether a person has checked this entry

Not yet reviewed by hand. The data is kernel-derived and gate-checked, but nobody has signed it off.

How often anything gets checked

The data is checked most days. Every build runs the theory gates before anything ships, and the review count below is recounted at the same time, so it is current as of the last deploy rather than as of whenever someone last updated a number by hand.

1 of 1,548 chord and scale entries have been reviewed by hand (0.1%). Counted August 2026.

How these pages are made and checked

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D♭ Minor 6/9

This is the same chord as D♭ Minor 6/9: the same keys on the keyboard, spelled with flats.

Open D♭ Minor 6/9 What are enharmonics?

Construction

C♯ Minor 6/9 = Root + Minor 3rd + Perfect 5th + Major 6th + Major 2nd = C♯, E, G♯, A♯, D♯

Note	Interval	Degree
C♯	Root	1
E	Minor 3rd	♭3
G♯	Perfect 5th	5
A♯	Major 6th	6
D♯	Major 2nd	2

C♯ Minor 6/9 : Frequently Asked Questions

What is the C♯ Minor 6/9 chord on piano?

The C♯ Minor 6/9 chord contains the notes C♯ – E – G♯ – A♯ – D♯. On piano, play these notes together to sound the chord.

What notes are in the C# Minor 6/9 chord?

The C# Minor 6/9 chord (C#m6/9) contains 5 notes: C#, E, G#, A#, D#. Formula: R-m3-P5-M6-M9.

How is C#m6/9 used in music?

C#m6/9 appears in jazz and neo-soul.

What is the scale degree formula?

C#m6/9 uses scale degrees 1-b3-5-6-9.

References & Further Reading

The note names, intervals, fingering, and harmony on this chord page are grounded in the following sources. Public domain treatises and scores are linked to their full text; primary data is piano.org's own interval-derived reference dataset, maintained by hand and corrected on the record, with no fixed publication date. Whether this particular entry has been reviewed by a person is stated in the maintained-by note above, not assumed here.

1
Prout, Ebenezer(1889)
Harmony: Its Theory and Practice
Public domain treatise
2
Riemann, Hugo(1896)
Harmony Simplified (English translation)
Public domain treatise
3
Beethoven, Ludwig van(1802)
Piano Sonata No. 14 in C♯ minor, Op. 27 No. 2 ("Moonlight"), i
Public domain score
4
piano.org
piano.org chord note dataset: 43 chord types × 18 keys, derived from interval construction rules
Primary data

Corrections

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