Chord Inversions & Voice Leading: A Music Theory Guide

Inversions describe how chord notes are ordered with the root no longer at the bottom. Triads have three positions; seventh chords have four (root position plus three inversions). Root position uses figured bass symbols 7-5-3 or simply '7'. First inversion moves the root to the top, creating a 6-5 chord with intervals of sixth, second, fifth, and third above the new bass note. The 6-5 chord resolves by moving the bass up by step and the seventh down by step. Second inversion places the original fifth as the bass, offering flexible resolution options. The 'crunch' method identifies roots by finding seconds (inversions of sevenths) within chords.

Dominant seventh chords have three inversions (5/6/5, 5/4/3, and 5/4/2) that function as embellishing chords rather than primary harmonic solutions, with voice leading requiring the leading tone to resolve up to the fifth in 5/6/5 and the seventh to resolve down by step in 5/4/2.

A seventh chord consists of four notes arranged in thirds. The dominant seventh chord is built on the fifth degree of natural major and harmonic minor scales, consisting of a major third plus minor third plus minor third. It has three inversions: first inversion (built on 7th degree, called dominant seventh chord in first inversion, notated as 6/5), second inversion (built on 2nd degree, called dominant seventh chord in second inversion, notated as 4/3), and third inversion (built on 4th degree, called dominant seventh chord in third inversion, notated as 4/2). Each inversion resolves differently: first inversion resolves to tonic triad with doubled tonic, second inversion resolves to expanded tonic triad with two tonics, and third inversion resolves to tonic sixth chord. The chord also has an alternative name 'minor major seventh chord' because the outer notes form a minor seventh interval. The naming convention depends on the interval of the second from the bass: if the second is a third, it's called a tertian chord; if the second is a fifth, it's called a quintsext chord; if the second is a second, it's called a second chord. Voice leading rules: the seventh moves to the root, the third moves to the third, the fifth moves to the root, and the bass note remains stationary. The tonic sixth chord is found by inverting the tonic triad.

The dominant seventh chord (built on the fifth scale degree) has three inversions: first inversion (6/5 chord), second inversion (4/2 chord), and third inversion (2 chord). When resolving, all notes must move to stable scale degrees (1, 3, 5), with the root being most important and resolving to the tonic. The first inversion resolves to an incomplete tonic triad (m), the second inversion resolves to a complete tonic triad (p), and the third inversion resolves to an incomplete tonic triad. Each resolution maintains four notes, with doubled notes indicated by 'plus 1' notation.

The dominant seventh chord has three inversions, each resolving to the tonic chord. First inversion (B-D-F-G) resolves to root position tonic. Second inversion (D-F-G-B) also resolves to root position tonic. Third inversion (F-G-B-D) resolves to first inversion tonic, though functionally equivalent to root position due to the root note's presence. In all cases, the leading tone resolves to tonic, the seventh resolves down, and the root remains common.

Species Counterpoint is a five-level step-by-step method for learning to write multiple independent melodic lines that harmonize together, developed by Joseph Fux in his 1725 treatise Gradus ad Parnassum; the method progresses from simple note-against-note writing (1st species) to increasingly complex techniques including suspensions and dissonances, ultimately teaching students to compose free counterpoint with proper harmonic connections and melodic independence.

This segment covers counterpoint (the art of multiple simultaneous melodies) and species counterpoint (proportional relationships between melodies). Species one is 1:1 proportion, species two is 2:1, species three is 3:1, and species four is 4:1. The presenter explains how these ratios create different rhythmic and harmonic relationships between melodic lines, with examples from Bach's Invention in D minor.

Counterpoint is the art of combining independent melodies - writing two or more melodies that work together. This trains strong melodic writing, voice independence, and voice leading discipline, skills that improve any composition from string quartets to film scores. Counterpoint separates pros from amateurs. Beginners start with species counterpoint (a step-by-step method by Fux with strict rules), practicing exercises in two parts then three parts. Intermediate study includes real counterpoint from Palestrina to Bach, studying Bach's inventions and corals, focusing on each voice's movement. Advanced work includes writing two/three-part inventions based on your own tunes, small fugues, and fugato passages. By integrating counterpoint into your style, you elevate musical sophistication, making compositions more melodically driven and texturally interesting.

Counterpoint is a music composition technique that involves creating interweaving melodic lines that operate horizontally rather than vertically; the basic approach involves starting with a melodic idea (called a 'point'), then imitating it in another voice either at the same pitch, transposed to a different pitch, or with rhythmic consistency but melodic variation, while simultaneously thinking about harmony to ensure both melodic and harmonic sense are maintained throughout the composition.

Species counterpoint is a fundamental compositional discipline established by Johann Joseph Fux in his 1725 treatise 'Gradus ad Parnassum'. The first species practices 'nota contra nota' using exclusively whole notes. The Cantus Firmus (fixed melody) provides the structural foundation while the counterpoint voice is created by the composer. Only specific triads are permitted: major and minor triads in root position and first inversion, and diminished triads exclusively in first inversion. Imitation must be avoided, and maximum melodic diversity should be sought. Voice leading requires conjunct motion after leaps, and parallel fifths/octaves must be avoided. Interval diversity is essential, with no more than three consecutive intervals of the same species. No note may be repeated in consecutive measures.

Advanced left-hand comping involves sophisticated patterns and voice leading techniques. The bass note and chord alternation pattern (bass-note, chord, chord, bass-note, bass-note, chord, chord) creates rhythmic and harmonic framework. Voice leading techniques include: (1) For ii-V progressions, moving the left-hand thumb down to mimic ii minor to V motion, landing on I; (2) With tenths voicings, the flat 7th of one chord becomes the 3rd of the next chord. Pianists should also practice tangents - longer periods without bass notes using nice voicings. These techniques allow the left hand to sound free and professional while supporting right-hand improvisation.

Comping is the art of playing chordal accompaniment in jazz, serving to support the harmony, highlight chord changes, and create rhythmic interest; effective comping involves using basic voicings (thirds and sevenths), incorporating extended notes like ninths and thirteenths, and employing smooth voice leading by finding the path of least resistance between chords while considering whether to use closed or open voicings based on hand availability and musical context.

Voice leading is the practice of moving inner lines of a chord progression by step or by common tone rather than by leap. When playing block chords with all fingers jumping to new positions, this creates bad voice leading. Good voice leading involves moving notes smoothly by step or maintaining common tones between chords, which is essential for realistic string orchestration since string players typically play melodic lines that move diatonically.

Tension chords in jazz guitar are extended chords that add color and sophistication to comping by stacking notes above the 7th (9th, 11th, and 13th), organized into five families: major (maj9, maj13, 6/9), dominant (9, 11, 13, 9sus4), minor (m9, m11, m6, m13), half-diminished, and diminished; effective comping requires smooth voice leading where the top note moves naturally between chords, avoiding dissonant 11ths in major/minor contexts and choosing the nearest chord with the closest top note for melodic flow.

Voice leading in jazz piano involves smooth transitions between chords by maintaining common tones and moving other voices by small intervals, with two key principles: outer-voice counterpoint (keeping soprano and bass melodically interesting and moving by step) and the law of conservation of energy (retaining as many common tones as possible between chords while minimizing voice movement). Unlike classical music, jazz allows parallel motion and doesn't strictly follow rules about parallel fifths or octaves, making it more flexible for creating smooth, connected chord progressions.