Tritone Substitutions Explained for Jazz and Blues

To create a bass line, identify the root note of each chord and place it in the bass position. The instructor demonstrates creating a bass line from D minor 7 by placing A in the bass position. Voice leading refers to smooth note movement between chords; users can grab notes from the top or bottom and shift them down an octave using Shift+Option. Dissonances like half-step intervals should be addressed. Chord substitution involves replacing a chord with another having similar harmonic function, such as substituting a diminished triad (B-D-F) with B minor (B-D-F#) for smoother pop music sound.

Tritone substitution replaces a dominant chord with another dominant chord a tritone (three whole steps) away, creating chromatic passing chords. Instead of D7 to G, use A♭7; instead of G7 to C, use D♭7. A shortcut is to go a half step above your destination chord. For example, E♭7 resolves to D. This technique creates smooth chromatic bass lines and crunchy extended voicings like E♭13♭9 that resolve beautifully. The video demonstrates multiple applications including A♭7♯11 to G, D♭7 to C, and B♭7 to A minor.

Multiple techniques for enhancing the basic progression: (1) Chromatic approach to E flat minor using diminished chords (E, A flat) as intermediates; (2) Augmented chord substitution (E flat augmented) creating tension that resolves to B flat minor; (3) E major 7th as a chromatic bridge back to B flat minor; (4) Overlapping notes between chords for smooth voice leading. These substitutions allow musicians to add dramatic effect and harmonic interest while maintaining the song's core progression.

This segment explores chromatic chord progression and voice leading techniques. The instructor demonstrates how the C note transforms into the seventh of the D chord, creating smooth harmonic transitions. The progression includes a B flat chord with ninth and two above, described as the opposite of the Jimmy Hendricks chord. The transition from dominant to D minor has only one proper execution method. The segment concludes with movement to the five chord through a diminished chord, creating dramatic tension before resolving.

Smooth voice leading involves minimizing movement between notes when transitioning between chords. Instead of starting each phrase from the root note, improvisers should find the closest note to the next chord and continue from there. This creates more fluid and connected musical phrases. Chromatic notes (from the bottom of the hierarchy) create tension and are used to add color. The challenge is knowing where to land and emphasize notes, especially at high speeds. Landing on inappropriate notes (like altered notes on a regular dominant chord) can sound dissonant. The emphasis and resolution points become crucial at high speeds.

Secondary dominance allows approaching any chord with its own V chord, regardless of that chord's function in the song. For example, in a progression like Cmaj7 - Fmaj7 - Amaj7 - Dmaj7 - Gmaj7 - Cmaj7, each chord can be preceded by its secondary dominant: C7 (V of F), E7 (V of A), D7 (V of G), and G7 (V of C). This technique creates many additional dominant chords that can be tritone substituted. Where previously only the final V chord could be substituted, secondary dominance opens opportunities for tritone substitutions throughout the entire progression, enabling more complex chromatic voice leading.

A tritone substitution is a dominant chord that is a tritone away from the original dominant chord. For example, F7 can substitute for B7 because they share the same tritone interval. A secondary dominant is a dominant chord that leads to a chord other than the tonic. For example, E7 is the secondary dominant of A minor, creating a stronger resolution to the A chord. These techniques add harmonic movement and sophistication to the arrangement.

Secondary dominant substitution replaces a diatonic minor seven chord with a dominant seventh chord that functions as a leading tone to that chord, creating stronger harmonic weight through tonicization. Tritone substitution replaces a dominant chord with another dominant chord a tritone away, always a half step above the target chord. Both techniques exploit harmonic relationships to create tension and resolution. The one-three-five-seven voicing structure underlies all examples, with hinge notes adding extension and color. These substitutions demonstrate how musicians can transform predictable progressions into expressive vehicles by understanding functional harmony and voice-leading principles.

Secondary dominant chords enhance harmonic tension by turning non-dominant chords into dominant 7 chords to create pull toward subsequent chords. In C major, only G7 is naturally dominant, but A7 or D7 can serve as secondary dominants. Tritone substitution can be applied to these secondary dominants as well—for instance, substituting A7 with Eb7. This combination of secondary dominance and tritone substitution creates complex chromatic movements while maintaining the underlying harmonic structure, offering bassists and composers expanded possibilities for harmonic expression.

This section explains dominant substitutes and their relationship to the tritone interval. Dominant substitutes replace the primary dominant chord while maintaining the same tension. The tension in a dominant chord comes from the tritone, a distance of three tones (six semitones) between two notes. In C7, the tritone exists between E (third) and Bb (minor seventh). A dominant substitute is found one semitone above the target chord. For example, to substitute for C7 (resolving to F), use Db7, which contains the same tritone notes (Bb and F) but inverted. This creates identical tension and resolution.

Advanced jazz harmony relies on sophisticated chord substitutions that transform basic progressions into complex harmonic landscapes. Coltrane changes replace a major chord with another major chord a major third below, creating immense harmonic tension through 1-5-1-5-1-5-1 progressions. Tritone substitution replaces a dominant 7th chord with another dominant 7th chord a tritone away, creating radical tension because the substituted chord's notes are diametrically opposed. Swedish blues, invented by Charlie Parker, uses cascading 2-5 progressions instead of traditional blues forms. These substitutions allow soloists to create sounds that don't exist in the rhythm section's basic harmony. Mastery requires studying pieces like 'Giant Steps' and 'Freight Train' to internalize these sophisticated harmonic vocabularies.

Coltrane developed a second variation of his harmonic changes that begins with minor chords rather than major chords. The progression follows the same sixth minor interval pattern but starts from a minor chord. The key innovation is that when starting from a minor chord, Coltrane did not want to resolve to the same minor chord but instead treated it as the 2 chord of a 2-5-1 progression. This requires a modification: instead of continuing with sixth intervals, the progression must modulate to a tritone from the starting chord, then apply the same sixth minor interval pattern to reach the tonic. This creates two distinct types of Coltrane Changes: those starting from major chords (Type 1) and those starting from minor chords (Type 2).

Minor third chord substitution involves replacing the original chord with another chord that is a minor third interval above it. In the example, D minor is substituted with F minor, then F minor is substituted with A flat minor. Each substitution moves up by a minor third (3 semitones). This creates a sequence of related minor chords that share common tones and create a smooth voice-leading effect.

Coltrane Changes is a harmonic substitution technique developed by John Coltrane, characterized by three modulations separated by major thirds (such as C major, F major, and Bb major), which create a distinctive 'triangle of Coltrane' that divides the circle of fifths into an equilateral triangle; this technique can be applied to jazz standards by substituting traditional ii-V-I progressions with these three-tone modulations, requiring musicians to adapt the melody to match the new harmonic structure, as demonstrated in Coltrane's reinterpretations of 'Body and Soul' and 'Countdown' (a variation of 'Tune Up').