Mastering Real-Time Reharmonization: Neo Jazz Piano Exercise

This section explains how to analyze chord progressions using Roman numerals, a universal system for describing harmonic relationships. In any major key, seven diatonic chords exist: I, IV, V are major; ii, iii, vi are minor; vii° is diminished. For example, in C major: C (I), F (IV), G (V) are major; Dm (ii), Em (iii), Am (vi) are minor; Bdim (vii°) is diminished. This system allows musicians to describe progressions like 'I-VI-IV-V' universally across all keys. The video demonstrates this with Tom Petty's 'Learning to Fly,' showing how F-C-Am-G progression translates to IV-I-vi-V in C major. Understanding this framework enables meaningful musical discussions and deeper appreciation of song structures.

This comprehensive lesson covers four diatonic chord progressions less commonly used in popular music. The She Loves You progression (I-6-3-5) uses the third chord, which is less frequent in progressions, giving it distinctive character. The Starlight progression (I-2-6-4) replaces the five chord with a two chord in the classic 5-6-4 pattern. The Jolene progression (i-3-7-1 in minor) creates clear cadence by returning to home. The Polly progression (i-3-7-6 in minor) differs by ending on the six chord. The lesson also covers two approaches to Roman numeral analysis in minor keys: relating to the major scale with flat symbols, or relating directly to the minor key. The practical approach for chord charts is to use Roman numerals relative to the major scale regardless of tonality, avoiding ambiguity when songs modulate between major and minor keys.

In any major scale, diatonic triads follow the pattern: I (major), ii (minor), iii (minor), IV (major), V (major), vi (minor), vii° (diminished). Voice leading connects chords by minimizing movement between chord tones. Playing all seven triads within a five-fret position enables smooth transitions and better musical flow. Practice transitioning between chords like G major to A minor to B minor to C major to D major to E minor to F# diminished, using full measures with four-beat transitions.

To explain any basic chord change between major/minor chords and diminished seventh chords, we simplify the 576 possible changes. There are only three diminished chords, and relative major/minor chords can be viewed as a single generalized tonic. The concept of cousin keys provides the structure: taking all four cousin keys of the tonic (1, ♭3, ♯4, 6) and their 1, 4, and 5 functions covers every function. This reduces 24 possible major/minor chords to three essential functions. The diatonic diminished graph is a hexagon where corners alternate between diatonic and diminished functions. Counterclockwise movement creates downward voice leading, clockwise creates upward voice leading.

Modal interchange involves borrowing from other keys while keeping the home key as the basis. The most common technique is borrowing from the relative minor. Starting from C major, musicians borrow from C Aeolian (the natural minor of E flat). This involves changing all chords except the tonic to their minor equivalents from the relative minor key. The result creates a dramatic emotional shift that feels like storm clouds gathering before returning to sunshine. The instructor demonstrates this with a basic I-III-IV-V progression in C major, showing how borrowing from the parallel minor creates a distinct emotional effect.

Modal interchange is the practice of importing chords from modes other than the primary mode (major or minor) into a composition. Approximately 60% of songs use major mode and 40% use minor mode. From any tonal center, seven diatonic chords can be extracted, and most song progressions use these diatonic chords, occasionally expanding with secondary dominants. From the seven notes of a major scale, six additional scales can be constructed: Dorian, Phrygian, Lydian, Mixolydian, Aeolian, and Locrian. These scales are relative to each other, meaning they share the same notes but start from different root notes. The distinguishing characteristic between these scales is the distribution of their two semitones, which gives each scale a unique sonic character. From a single tonal center, seven parallel scales can be constructed: Ionian (major), Dorian, Phrygian, Lydian, Mixolydian, Aeolian, and Locrian. These are parallel because they share the same root note but have different interval structures. From each of these seven scales, triads and seventh chords can be constructed, resulting in different chord qualities for each degree. Modal interchange involves importing chords from other modes into the primary mode, most commonly the major mode which Western ears assimilate as basic. When importing triads, there is less variety than with seventh chords. The primary mode that major mode borrows from is Aeolian, which presents a slight sonic incompatibility regarding the function each chord serves within a harmonic chain. When these borrowed chords are used, they contrast and destabilize the tonal stability of the original mode. When importing chords to the major mode, two rules must be followed: (1) diminished triads should not be used, and (2) borrowed chords must have at least one note related to the destination scale or mode. For the first degree, options include the diatonic major chord or the minor chord from Aeolian mode. For the second degree, options include the diatonic minor chord or the major chord from Lydian mode. For the third degree, options include the diatonic major chord or the major chord from Aeolian mode. For the fourth degree, since no mode has a major third degree, the minor fourth degree from Aeolian mode is borrowed. For the fifth degree, the minor fifth degree from Aeolian mode is borrowed. For the sixth degree, the major sixth degree from Aeolian mode is borrowed. For the seventh degree, the major seventh degree from Aeolian mode is borrowed. The diminished fourth degree from Lydian mode and major seventh degree from Locrian mode are rarely used. When using borrowed chords from other modes, their duration should be brief because they temporarily depart from the original mode's sonic character. If multiple borrowed chords are used consecutively, there is a risk of modulation because the ear loses the acoustic reference to the original mode. The first degree minor chord is borrowed from Aeolian mode and is rarely used. When used, it is typically accompanied by the first degree major chord. The flat second degree chord is borrowed from Phrygian mode and is typically combined with the first degree major chord. The second degree major chord is borrowed from Lydian mode and is typically combined with the first and fourth degrees in closed progressions. The flat third degree chord is borrowed from Aeolian mode and is typically used in closed harmonic progressions. The minor fourth degree chord is borrowed from Aeolian mode and can be combined with the first, fourth, and fifth degrees major. The minor fifth degree chord is borrowed from Aeolian mode and is commonly combined with the first degree major, third degree minor, and fourth degree major. The flat sixth degree chord is borrowed from Aeolian mode and can be combined within closed harmonic patterns or with other borrowed chords. The flat seventh degree chord is borrowed from Aeolian mode and can be combined within closed harmonic patterns or with other borrowed chords. All borrowed chords can be classified as sub-dominant minor (SDm). They are more unstable than tonic or sub-dominant chords but less unstable than dominant chords. Their placement in time should follow the rhythm of strong and weak beats based on the preceding chord. However, when creating closed harmonic patterns, this rule can be temporarily suspended. When composing open progressions, the established order of stable (tonic), semi-stable (sub-dominant), and unstable (dominant) functions should be respected. When composing melodic lines over borrowed chords, the scale should be adapted to the origin mode. For the five major triads of modal interchange, the Lydian scale can be applied except for the second degree, which should use Mixolydian. For the minor triads of modal interchange, the Dorian scale should be applied except for the fourth degree, which should use the melodic minor scale.

Modal interchange is a harmonic technique where you borrow chords from parallel modes of your current key. A parallel key is a major key containing the same root note. For C Ionian, the parallel keys are C, Bb, Ab, G, F, Eb, and Db major. Each mode comes from a specific key: Ionian from C, Dorian from Bb, Phrygian from Ab, Lydian from G, Mixolydian from F, Aeolian from Eb, and Locrian from Db. To perform modal interchange, you pull Dorian and Lydian chords from these keys and place them back in your original key. This technique can be used as a composer to replace subdominant chords or as a jazz player for superimpositions.

Modal interchange, also known as borrowed chords or modal mixture, is a harmonic technique where non-diatonic chords are borrowed from a parallel key (a key that shares the same tonic note but has different notes, such as C major and C minor) to add harmonic variety to a chord progression; this technique involves temporarily moving away from the key center before resolving back to the original key, with common examples including borrowing the ii chord (D half-diminished) or iv chord (F minor) from the parallel minor scale in a major key context.

The video demonstrates modal interchange, where chords from parallel modes are borrowed to create harmonic interest. This technique involves temporarily shifting to a related mode to introduce new harmonic colors. The performer shows understanding of how borrowing chords from parallel modes can enrich harmonic vocabulary while maintaining tonal coherence.

Chord melody involves playing chord shapes while extracting individual notes to create melodic lines. The C# minor chord is played while pulling out the 5th and 4th notes, creating a sustained, ringing sound similar to piano with sustain pedal. The technique involves keeping the chord shape while selectively releasing notes. The melody follows a specific progression: 4-5-7-9 on the chord, then 9-12 on B string, followed by 9-9-9-9-12-11 on G string, resolving back to 9 on B string. This demonstrates how box patterns create chord melody passages.

The 'red ring' technique is essential for smooth solo ukulele playing: once you press a chord, keep those fingers in place while playing melody notes. This prevents the chord from breaking and creates continuous sound. The sustain pedal concept in piano allows notes to continue sounding after release; in ukulele, this is achieved by maintaining finger pressure on the fretboard while adding melody notes. Without this technique, music sounds choppy and disconnected. The key is to maintain chord shape while adding melody, rather than releasing and repressing for each note. This creates a connected, professional sound.

The first arrangement level involves playing the melody with the right hand while playing fundamental notes (the root notes that give the chord its name) with the left hand. This is described as a simple but effective technique that immediately makes the music sound more professional. The fundamental note is defined as the note that gives the chord its name.

This practice method helps develop the ability to anticipate chord shapes while playing melody notes. Since melody notes in solos often correspond to notes within the chord being played, this practice helps musicians understand the relationship between melody and harmony, improving solo playing ability.

Melody notes requiring sustain should be held without releasing while accompaniment continues. Accompaniment should be played more softly than sustained melody notes. Chord progressions should follow the song's harmonic structure, with C chord fingerstyle involving 2nd and 5th strings as melody while holding 4th and 3rd strings. The progression Do-Do-Re-Si creates smooth transitions between sections.