C# Dominant Seventh Flat Thirteen Added Guitar Chord Charts & Variations

C#7(b13) (C# seventh flat thirteen) follows the formula 1, 3, 5, b7, b13, so on C# it reads C#, E#, G#, B and A. The flat thirteenth A is the same pitch as the sharp fifth, G##, though the natural fifth G# stays too.

Its core is the dominant seventh C#, E#, G#, B, and the flat thirteenth A is the colour on top. Spelling F as E# keeps the letter names in order, one third apart, even though the sound is the same. Try the C# Mixolydian b6 scale next. It is the fifth mode of the melodic minor scale and it contains all five chord tones, so it fits the chord from start to finish.

On a chart it may be written 7b13 or 7-13, and all of these spellings mean the same chord.

C# 7th with flat 13th guitar chord is also written as C#7(b13), C#7b13 or C#7-13.

Notes that compose the C# 7(b13) chord:

C# E# G# B A

Tones in the Dominant Seventh Flat Thirteen Added chord:

Formula: 1 3 5 #5 b7

C# 7(B13) Chord Interactive Fretboard

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Play This Chord With Other Roots

C 7(b13) | D 7(b13) | E 7(b13) | F 7(b13) | G 7(b13) | A 7(b13) | B 7(b13) | C#7(b13) | D#7(b13) | F#7(b13) | G#7(b13) | A#7(b13) | Ab7(b13) | Bb7(b13) | Db7(b13) | Eb7(b13) | Gb7(b13)

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Created by

Giancarlo Facoetti

Giancarlo is a musician (teaching guitar since 2000), software engineer, AI consultant and published researcher

FAQ

What notes does C#7(b13) contain?

C#, E#, G#, B and A. These are the root, a major third, a perfect fifth, a minor seventh and a flat thirteenth. The E# sounds the same as F.

What does the b13 in C#7(b13) mean?

It is the thirteenth degree lowered by a half step. On C# that note is A, a minor sixth from the root one octave up, sitting a half step higher than the fifth G#.

Is C#7(b13) the same as Db7(b13)?

They sound the same. Db7(b13) is spelled Db, F, Ab, Cb and Bbb, while C#7(b13) uses C#, E#, G#, B and A. Sharp names tend to suit sharp keys and flat names flat keys.

Which scale suits the C# seventh flat thirteen chord?

The C# Mixolydian b6 scale, spelled C#, D#, E#, F#, G#, A and B, contains all five chord tones. It is the fifth mode of the melodic minor scale.

Why is the third of C#7(b13) written E# instead of F?

A chord third takes the letter two steps from the root letter C, which is E. The major third higher than C# is therefore E#. Writing F would describe a diminished fourth instead.