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Simplest form of metric modulation, unmarked ( = ), in a piece by J.S. Bach. Slow introduction followed by an allegro traditionally taken at double the speed. Sixteenth notes in the old tempo prepare for eighth notes in the new tempo (Weisberg 1996, 51-52). Play w/out repeat (help·info)
In music, metric modulation is a change in pulse rate (tempo) and/or pulse grouping (subdivision) which is derived from a note value or grouping heard before the change. Examples of metric modulation may include changes in time signature across an unchanging tempo, but the concept applies more specifically to shifts from one time signature/tempo (metre) to another, wherein a note value from the first is made equivalent to a note value in the second, like a pivot or bridge. The term "modulation" invokes the analogous and more familiar term in analyses of tonal harmony, wherein a pitch or pitch interval serves as a bridge between two keys. In both terms, the pivoting value functions differently before and after the change, but sounds the same, and acts as an audible common element between them. Metric modulation was first described by Richard Franko Goldman (1951) while reviewing the Cello Sonata of Elliott Carter, who prefers to call it tempo modulation (Schiff 1998, 23). Another synonymous term is proportional tempi (Mead 2007, 65).
A technique in which a rhythmic pattern is superposed on another, heterometrically, and then supersedes it and becomes the basic metre. Usually, such time signatures are mutually prime, e.g., 4 4 and 3 8, and so have no common divisors. Thus the change of the basic metre decisively alters the numerical content of the beat, but the minimal denominator (1 8 when 4 4 changes to 3 8; 1 16 when, e.g., 5 8 changes to 7 16, etc.) remains constant in duration. (NicolasSlonimsky 2000)
Determination of the new tempo
The following formula illustrates how to determine the tempo before or after a metric modulation, or, alternatively, how many of the associated note values will be in each measure before or after the modulation:
Note that this tempo, quarter note = 126, is equal to dotted-quarter note = 84 (( = ) = ( = )).
A tempo (or metric) modulation causes a change in the hierarchical relationship between the perceived beat subdivision and all potential subdivisions belonging to the new tempo. Benadon (2004) has explored some compositional uses of tempo modulations, such as tempo networks and beat subdivision spaces.
Three challenges arise when performing metric modulations:
Grouping notes of the same speed differently on each side of the barline, ex: (quintuplet =sextuplet ) with sixteenth notes before and after the barline
Subdivision used on one side of the barline and not the other, ex: (triplet =) with triplets before and quarter notes after the barline
Subdivision used on neither side of the barline but used to establish the modulation, ex: (quintuplet =) with quarter notes before and after the barline
Benadon, Fernando (2004). "Towards a Theory of Tempo Modulation", Proceedings of the 8th International Conference on Music Perception and Cognition, August 3rd-7th, 2004, Evanston, Illinois, edited by S. D. Lipscomb, 563-66. Evanston, IL: Northwestern University, School of Music; Sydney, Australia: Causal productions. ISBN1-876346-50-7 (CD-ROM).
Slonimsky, Nicolas (2000). "Metric Modulation". In A Dictionary of the Avant-Gardes, second edition, edited by Richard Kostelanetz; senior editor, Douglas Puchowski; assistant editor, Gregory Brender, 407. New York: Schirmer Books. ISBN978-0-02-865379-2 (cloth). Paperback reprint, New York and London: Routledge, 2001. ISBN978-0-415-93764-1.