Which term refers to a fast tempo, even faster than Allegro?

The term that refers to a fast tempo, even faster than Allegro, is indeed Pretissimo. In musical terminology, Allegro typically indicates a lively tempo, generally set at around 120 to 168 beats per minute. Pretissimo, on the other hand, signifies a tempo that exceeds even Allegro, often described as extremely fast or rapid.

By understanding the context and structure of tempo indications, Pretissimo fits into a hierarchy of speed in music. It is crucial for musicians to recognize these distinctions, as tempo directly affects the overall energy and feel of a piece. The other terms provided do not denote faster tempos than Allegro. Andante describes a moderately slow tempo, Rubato refers to expressive and flexible tempo adjustments, and Tranquilo indicates a calm or tranquil pace, all of which do not match the speed indicated by Pretissimo.