Metric Modulation - Score Notation

Score Notation

Metric modulations are generally notated as 'note value' = 'note value'.
For example,

This notation is also normally followed by the new tempo in parentheses.
This is analogous with the assignment in imperative computer languages:
{x = f(x);} ≡ {x_new = f(x_old);}

Before the modern concept and notation of metric modulations composers used the terms doppio piu mosso and doppio piu lento for double and half-speed, and later markings such as:

indicating double speed, which would now be marked (=) (Weisberg 1996, 52).

L'istesso tempo was used for what may now be notated with metric modulation markings. For example: 2/4 to 6/8 (=.), will be marked l'istesso tempo, indicating the beat is the same speed.

Metric modulation markings are frequently used to indicate swing rhythm.