Tritone Substitution
Replace any dominant 7th chord with one a tritone (6 semitones) away for chromatic bass movement, richer color, and jazz-flavored resolutions. Used in bebop, neo-soul, R&B, and film scoring.
What Is a Tritone Substitution?
A tritone substitution (also called a tritone sub or tri-sub) replaces a dominant 7th chord with another dominant 7th chord whose root sits exactly 6 semitones away. Because the tritone divides the octave perfectly in half, every dominant chord has exactly one tritone substitute.
The substitute chord works because both chords share the same two notes that create the characteristic tritone tension: the 3rd and 7th of the original chord become the 7th and 3rd of the substitute chord (swapped). The resolution to the tonic is preserved because both notes still want to resolve by half steps.
The Classic Example: G7 to Db7
Why It Works: Shared Tritone Theory
Swapped Roles
The 3rd of G7 (B) is the enharmonic 7th of Db7. The 7th of G7 (F) is the 3rd of Db7. Same notes, different function.
Chromatic Bass
Instead of a 5th leap (G to C), the bass moves a half step down (Db to C). Chromatic bass lines feel inevitable and smooth.
Same Resolution
Both B and F (in G7) and F and B (in Db7) resolve identically to C and E, the root and 3rd of Cmaj7. The tonic arrival is unchanged.
The tritone (augmented 4th / diminished 5th) is the only interval that maps two dominant chords to each other. A perfect 5th apart would give you a different key center. Only the tritone creates this symmetric swap of 3rd and 7th.
Tritone Substitutions in All 12 Keys
Every dominant 7th chord pairs with exactly one tritone substitute. The six pairs cover all 12 dominant chords.
| Original Dom7 | Notes | Tritone Sub | Sub Notes | Shared Tritone | Bass Movement |
|---|---|---|---|---|---|
| G7 | G B D F | Db7 | Db F Ab Cb (B) | B / F | G to Db (half step above C) |
| D7 | D F# A C | Ab7 | Ab C Eb Gb (F#) | F# / C | D to Ab (half step above G) |
| A7 | A C# E G | Eb7 | Eb G Bb Db (C#) | C# / G | A to Eb (half step above D) |
| E7 | E G# B D | Bb7 | Bb D F Ab (G#) | G# / D | E to Bb (half step above A) |
| B7 | B D# F# A | F7 | F A C Eb (D#) | D# / A | B to F (half step above E) |
| F#7 | F# A# C# E | C7 | C E G Bb (A#) | A# / E | F# to C (half step above B) |
| C7 | C E G Bb | F#7 | F# A# C# E | E / Bb | C to F# (half step above F) |
| F7 | F A C Eb | B7 | B D# F# A | A / Eb | F to B (half step above Bb) |
| Bb7 | Bb D F Ab | E7 | E G# B D | D / Ab | Bb to E (half step above Eb) |
| Eb7 | Eb G Bb Db | A7 | A C# E G | G / Db | Eb to A (half step above Ab) |
| Ab7 | Ab C Eb Gb | D7 | D F# A C | C / Gb | Ab to D (half step above Db) |
| Db7 | Db F Ab Cb (B) | G7 | G B D F | F / B | Db to G (half step above F#) |
Cb and B are enharmonically the same note. The table uses the enharmonic spelling that is most common in context.
The Formula: How to Find Any Tritone Sub
- 1 Identify the dominant 7th chord you want to substitute. It must be a dominant 7th (1, 3, 5, b7) to work correctly.
- 2 Count 6 semitones up (or down) from the root. G is 6 semitones above C#/Db. A is 6 semitones above Eb. Six steps either direction lands on the same note.
- 3 Build a dominant 7th on that root. Formula: 1, 3, 5, b7. That is your tritone substitute.
- 4 Update the bass line to the new root. The bass now resolves by half step instead of a 5th. Adjust your inner voices for smooth voice leading.
Tritone Substitution in Real Progressions
See how tritone subs transform common jazz and soul progressions:
ii-V-I (Jazz Cadence) in C major
I-VI-II-V (Turnaround) in C major
IV-V-I (Gospel Resolution) in C major
Blues with Tritone Subs in C blues
Minor ii-V-i in C minor
Tritone Substitution by Genre
| Genre | How It Is Used | Example | Frequency |
|---|---|---|---|
| Bebop Jazz | Core harmonic vocabulary. Used on every dominant chord. | Charlie Parker, Dizzy Gillespie - ii-V-I with constant subs | Constant |
| Neo-Soul | Single substitution for color on a cadence or loop. | Robert Glasper, Thundercat - one sub per phrase | Occasional |
| R&B / Funk | Tritone approach on V chord to I before groove resets. | D'Angelo - dominant subs on turnarounds | Occasional |
| Lo-Fi Hip-Hop | Sample chops that happen to contain tritone subs from jazz records. | Many lo-fi beats sampled from 1950s-60s jazz recordings | Accidental/sampled |
| Film Score | Chromatic bass movement for tension without full dissonance. | John Williams, Bernard Herrmann - tritone subs in suspense cues | Deliberate tension tool |
| Gospel / Contemporary Gospel | Tritone approach on V to I for dramatic resolution. | Choir arrangements with chromatic cadences | Occasional |
Using Tritone Substitution in Your DAW
Piano Roll: Swap the Chord
In your Piano Roll, select the dominant 7th chord block. Delete the root (leave 3rd, 5th, b7). Move the root note 6 semitones up or down. Rebuild the chord on the new root with 3rd, 5th, and b7.
Update the Bass Track Separately
Keep the upper voices (3rd, 5th, b7) but move the bass note to the tritone sub root. The inner voices often need minimal movement since two of them are already in both chords.
Detect Key First
Before adding subs, use BeatKey to detect the key of your sample or reference track. Knowing the key tells you which chord is the V (dominant) chord, which is the most natural place to apply a tritone sub.
Use Chord Finder to Identify Existing Chords
Upload your audio to BeatKey Chord Finder to see the current chord progression. Identify any dominant 7th chords in the result. Those are your tritone sub targets.
Altered Scale on the Sub
For jazz improvisation or melodic writing, the Altered Scale (7th mode of melodic minor) works perfectly over both the original dominant and its tritone sub. Over Db7 resolving to Cmaj7, use Db Altered (= D melodic minor).
Watch for Key Clashes
The tritone sub introduces notes outside the home key (e.g., Db, Ab, Cb in G7's sub Db7 when you are in C major). Chromatic notes create tension before resolution. This is intentional in jazz, but check that your melody notes agree or intentionally clash.
Related Chord Theory
Find Dominant Chords in Your Audio
Before applying tritone subs, detect what chords are already in your sample or loop. BeatKey Chord Finder analyzes your audio locally in the browser.