tremolo explained
The rapid repetition of a single note or rapid alternation between two notes, creating a trembling effect
In Depth
Tremolo takes two forms: measured tremolo (notes repeated at a specific rhythmic value, written with beams through the stem) and unmeasured tremolo (notes repeated as rapidly as possible, written with three beams). On strings, bowed tremolo creates an agitated, shimmering texture. On piano, finger tremolo alternates between two notes. Tremolo is one of the most effective orchestral devices for creating tension, excitement, or atmospheric mystery. It is also the foundation of mandolin and balalaika technique.
The tremolo string passage at the opening of Beethoven's Ninth Symphony created such an unprecedented atmosphere of mystery that it influenced every subsequent symphonist.