Allegro

Allegro (It., 'lively'), the fourth of the five principal degrees of movement in music, implying that the piece is to be performed in a quick or lively style. Allegro, like all the other degrees of movement, is often modified by other terms, such as allegro non tanto, allegro ma non troppo, allegro moderato, maestoso, giusto, eommodo, vivace, assai, di molto, con brio, &c. As a substantive, allegro is used as the name of a whole piece of music, or a movement (usually the first) of a symphony, sonata, or quartet.