Understanding Passing Tones and Neighbor Tones in Music Theory

Second species counterpoint introduces dissonance into musical texture, adding seconds, thirds, and sevenths to create richer sounds. Dissonance must be prepared and resolved, depending on surrounding consonances. The added part uses half notes while the cantus firmus uses whole notes, with the first note of each bar being consonant. Two types of dissonance exist: neighbor notes (static, returning to original position) and passing notes (dynamic, moving stepwise to another note). Effective counterpoint requires balancing these types to create interesting melodic motion without becoming incoherent.

The Second Species uses half notes against whole notes, with the first beat always consonant. The Third Species uses quarter notes against half notes, introducing more rhythmic complexity and figures like cambiata and appoggiatura. The Fourth Species (suspension) is nearly opposite: a dissonant note arrives early and resolves later. Each species increases rhythmic complexity while maintaining the Cantus Firmus structure. The Fourth Species introduces harmonic tension through delayed resolution.

In second species counterpoint, two notes of counterpoint are written against one note of the cantus firmus, with the first note (strong beat) always being a consonance and the second note (weak beat) being either a consonance or a dissonance that must be approached and left by step as a passing note; when the cantus firmus is in the lower voice, the initial interval can be a fifth or octave, with the penultimate measure ending in a fifth followed by a sixth and the final measure in an octave, while when the cantus firmus is in the upper voice, the initial interval can only be an octave, with the penultimate measure ending in a fifth followed by a minor third and the final measure in a unison.

Third species counterpoint requires writing four notes for each note of the cantus firmus. This species becomes more elaborate and involves melodic contour considerations, including melodic leaps and stepwise motion. The student must create interesting melodic lines that combine well with the cantus firmus.

Non-chord tones (or non-harmonic tones) are melodic notes that are not part of the underlying chord sounding at a given moment, and they are essential to classical music's expressive power. The eight main types include passing tones (connecting chord tones a third apart with stepwise motion), neighbor tones (embellishing a single chord tone with away-and-back motion), double passing tones (connecting chord tones a fourth apart with two consecutive non-chord tones), suspensions (sustained chord tones that become dissonant when the harmony changes and resolve by step), appoggiaturas (leap-in, step-out dissonances), double neighbors (pairs of neighbor tones allowing leaps between them), escape tones (step-in, leap-out at cadences), and anticipations (non-chord tones that precede their harmonic preparation). These tones are typically dissonant and require careful resolution, with their classification based on melodic motion relative to surrounding chord tones.

Embellishing tones (also called non-chord tones or non-harmonic tones) are notes that are not part of the prevailing chord but decorate structural notes in a melody, serving to add expressiveness and complexity to music; they are classified by their rhythmic placement (accented vs. unaccented) and their melodic movement (by step or by leap), with common types including passing tones (stepwise motion between chord tones), neighboring tones (decorating a single structural tone), appoggiaturas (accented tones approached by leap and resolved by step), anticipations (tones arriving early for the next chord), syncopations (accented notes on weak beats), and suspensions (prepared dissonances that resolve by step).

Embellishing tones are non-chord tones that decorate melodies and enhance their expressiveness by adding color, depth, and emotional resonance; they include passing tones (smoothly connecting chord tones), neighbor tones (alternating between chord and non-chord tones), appoggiaturas (accented non-chord tones approached by leap and resolved by step), suspensions (delayed resolution creating tension), retardations (accented non-chord tones resolving upward), anticipations (preparing for upcoming chord changes), pedal points (sustained bass notes while harmonies change), and escape tones (non-chord tones reached by step and left by leap), each serving to transform simple melodies into emotionally rich musical expressions as demonstrated by composers like Bach, Beethoven, Chopin, and Mozart.

Bach's chorales are essential piano literature that develops chord-reading skills, which many pianists lack despite excelling at scales and arpeggios; unlike traditional technical exercises that only use white keys, chorales train pianists to read and play vertically aligned chords, making them more valuable than famous etude collections like Chopin or Hanon for developing complete musical proficiency.

This comprehensive segment covers the complete process of analyzing Bach chorales. The analysis begins with identifying the tonal center through the first chord, which may differ from the key signature. The instructor demonstrates how to identify chord functions (tonic, subdominant, dominant) and their inversions by examining the bass note and voice-leading patterns. The segment covers anticipations, where notes appear before their expected resolution, and the Picardy third technique. The analysis explores voice-leading techniques, including how the seventh of a dominant seventh chord resolves downward by step. The segment covers cadence analysis, including cadence rota (broken cadence), where the expected resolution is altered to create surprise and tension. The instructor explains how to identify chord inversions and how chord position affects harmonic function. The segment concludes with an explanation of the tonal plan, showing how Bach modulates from the home key to the relative minor, then to the dominant of the relative minor, before returning to the original tonal center.

Bach elaborates simple chord progressions in his chorales through sophisticated techniques including chromatic chords (IV7, VIIb), secondary dominants, borrowed chords from parallel minors, and suspensions, demonstrating how to transform basic harmonic structures into rich, expressive music by carefully selecting chord voicings, using contrary motion passing notes, and employing strategic dissonances that resolve musically meaningful intervals.

Voice leading is the technique of arranging chord tones so that individual voices move smoothly from one chord to the next, minimizing large leaps and maintaining smooth melodic lines. Arranging involves placing different musical parts (melody, harmony, bass) in different octaves to create a balanced sound. The melody might be placed in a higher octave while the harmony is placed in a lower octave. Arrangers select instruments based on their timbre and role in the musical piece. Different instruments can perform the same notes but create different emotional effects. The choice of instruments significantly impacts the overall sound and character of the arrangement.

Voice leading is the way individual voices move from chord to chord in an arrangement. Good voice leading occurs when all individual voices move smoothly between chords. While parallel motion (where all voices move in the same direction) creates a blocky structure, it can become boring. More creative approaches involve having individual voices move in different directions relative to each other or interplay with one another, not just supporting the main melody.

Voice leading centers on avoiding identical chord shapes consecutively. Root position chords alone create bland progressions; alternating inversions (root, first, second) generates dynamic movement. After establishing strong progressions, musicians add color through approach notes—moving from chord tones by one or two steps above/below, or using chromatics. This systematic approach transforms predictable harmonic movement into engaging musical expression.

This video presents five fundamental voice leading rules that help musicians create smoother, more professional arrangements and compositions: (1) Same tones should remain stationary when they appear in consecutive chords (the 'rule of laziness'), (2) Voices should move as little as possible, following the 'law of the nearest path' to resolve to the closest available tone in the next chord, (3) Avoid parallel octaves and fifths, as these create weak harmonic motion, (4) The third of the dominant chord should always resolve to the tonic (fundamental tone) of the key, and (5) Seventh chords should resolve downward to the third of the tonic chord. These rules are demonstrated using a C major cadence (I-IV-V-I progression) and apply to both chord accompaniment and keyboard arrangements.