Cadence
In music, a cadence is a chord progression of at least two chords that concludes a musical phrase or section, creating a sense of resolution, rest, or partial closure through harmonic means.[1][2] The term originates from the Latin cadere, meaning "to fall," which historically alluded to the descending stepwise motion in the melody or bass line at the end of phrases in early polyphonic music.[3][4] Cadences serve as essential structural elements in Western tonal music, functioning analogously to punctuation in language by articulating the boundaries of phrases and larger forms, thereby guiding the listener's perception of musical flow and hierarchy.[2][5] They emerged prominently in the development of harmonic theory during the Renaissance and Baroque periods, evolving from modal practices to support the establishment of tonality in the common practice era.[6] The four main types—perfect (V–I), plagal (IV–I), half (ending on V), and deceptive (V–vi)—each convey varying degrees of finality or surprise, influencing everything from simple folk tunes to complex symphonic works.[1][7] Beyond classical contexts, cadences appear in diverse genres, including jazz, pop, and even non-Western traditions adapted through global influences, underscoring their versatility in creating rhythmic and emotional punctuation.[8]Fundamentals
Definition and Role
In music theory, a cadence is a melodic or harmonic formula that creates a sense of resolution, pause, or conclusion, typically marking the end of a phrase or larger section.[9] This concept, rooted in Western tonal practices, functions as a point of arrival, fulfilling listener expectations built through preceding musical tension.[10] The primary roles of cadences include providing closure to musical phrases, sections, or entire pieces, thereby articulating the overall form and allowing the listener to perceive structural boundaries.[2] They also establish and reinforce tonal centers by directing harmonic motion toward stability, often the tonic, which anchors the key of the composition.[11] Furthermore, cadences contribute to formal structures, such as binary form—where they delineate the two main parts—or sonata form, where they serve as signposts for thematic divisions and recapitulations.[12][13] Cadences are primarily harmonic, relying on chord progressions to generate and resolve tension, though they may incorporate melodic contours or rhythmic patterns to enhance effects of rest or forward momentum.[14] In both cases, they signal whether the music should pause for completion or proceed with continuation, shaping the perceptual flow of the piece.[7] For instance, in simple tonal music, a basic cadence might conclude a phrase by landing on the tonic, offering a momentary stability that invites reflection before the next idea begins.[2] Common classifications, such as the authentic cadence, exemplify full resolution to the tonic, underscoring these functional principles.[9]Nomenclature and Terminology
The term "cadence" derives from the Latin cadentia, meaning "a falling," and evolved from the medieval concept of the clausula vera ("true close"), a dyadic intervallic formula providing closure in polyphonic music of the 12th to 16th centuries.[15] This clausula vera, typically involving a sixth resolving to an octave between voices, served as the structural basis for later harmonic cadences in tonal music, transitioning from modal to functional harmony during the Renaissance.[10] By the 17th century, theorists including Johannes Lippius contributed to the development of harmonic theory, including descriptions of cadences as progressions ending phrases and marking a shift from intervallic to chordal resolution.[6] In English-language music theory, cadences are classified as authentic, plagal, half, and deceptive, with subtypes like perfect authentic cadence (PAC) and imperfect authentic cadence (IAC).[16] Equivalent terms appear in other European languages: in French, cadence parfaite for perfect cadence and cadence imparfaite for imperfect; in German, authentische Kadenz and perfekte Kadenz; in Italian, cadenza autentica and cadenza perfetta; and in Spanish, cadencia auténtica and cadencia perfecta.[17] These variations reflect national traditions in pedagogy, with French and German terms emphasizing perfection or authenticity, while Italian retains roots in earlier contrapuntal nomenclature. Common abbreviations in modern music theory include PAC for perfect authentic cadence (V–I with both chords in root position and soprano resolving to tonic), IAC for imperfect authentic cadence (V–I with variations in voicing or inversion), HC for half cadence (ending on V), PC for plagal cadence (IV–I), and DC for deceptive cadence (V–vi).[2] These symbols facilitate analysis in scores and textbooks, standardizing discussion across English-dominant academic contexts.[18] Beyond Western traditions, analogous concepts of phrase closure exist in non-Western music, though not always harmonic. In Indian classical music, sam denotes the first beat of a tala (rhythmic cycle), providing rhythmic resolution and marking the return to stability, paralleling the conclusive function of a Western cadence. Similarly, in Arabic music, watad (a metrical "peg" from prosody) structures rhythmic units in iqa'at, contributing to cadential emphasis at phrase ends akin to harmonic punctuation.[19]Primary Harmonic Classifications
Authentic Cadence
The authentic cadence, also known as the full cadence, is a harmonic progression from the dominant chord (V) to the tonic chord (I) that provides the strongest sense of resolution and closure in tonal music.[2] This V–I motion establishes the tonic as the gravitational center, marking the end of a phrase, section, or entire piece with a conclusive effect.[20] Unlike weaker progressions such as the half cadence, which ends on the dominant for a sense of continuation, the authentic cadence achieves full harmonic stability on the tonic.[2] Authentic cadences are classified into two main subtypes: the perfect authentic cadence (PAC) and the imperfect authentic cadence (IAC). A perfect authentic cadence requires both the dominant and tonic chords to be in root position, with the bass moving from the dominant's root (scale degree 5) to the tonic's root (scale degree 1), and the melody (typically the soprano voice) concluding on the tonic pitch (scale degree 1) above the tonic chord.[21] This configuration maximizes the sense of finality through precise alignment of structural elements.[22] In contrast, an imperfect authentic cadence follows the same V–I progression but relaxes at least one of these criteria: the chords may be inverted, the bass may not end on the tonic root, or the melody may conclude on the third (scale degree 3) or fifth (scale degree 5) of the tonic chord rather than the root.[21] These variations still convey resolution but with slightly less emphasis than the PAC.[22] Key harmonic details emphasize root-position triads for both chords to ensure stability and strength, with the dominant often appearing as a V7 chord to heighten tension before release.[23] Voice leading rules are crucial for smooth resolution: the leading tone (scale degree 7 in the dominant chord) must resolve upward by step to the tonic (scale degree 1), typically in an outer voice for prominence, while the dominant's third (scale degree 7 as the chord seventh in V7) resolves downward by step to the tonic's third.[24] These resolutions create stepwise motion and avoid parallels, reinforcing the cadence's structural integrity.[25] A basic example occurs in C major, where the dominant chord is G7 (G–B–D–F), progressing to the tonic C major (C–E–G–C). For a perfect authentic cadence, the bass moves from G to C, the soprano from B (leading tone) to C, the alto from F (seventh) to E, and the tenor from D to G, as shown in simple four-part notation:This progression illustrates the classic resolution, with the leading tone B ascending to C and the seventh F descending to E.[24] An imperfect variant might place the soprano on E (the third) over the final C chord, reducing the emphatic arrival on the root.[22]B C F E D G G C G7 CB C F E D G G C G7 C