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How is rullo played?
Execute the roll appropriate to the instrument, written duration, beater and notation. A smooth sustained impression is a common goal, but not every roll must hide every stroke: a closed buzz roll, an open double-stroke roll and a timpani single-stroke roll use different rebound and alternation patterns. Evenness of spacing and level often matters more than raw speed, while the score may instead require a measured rhythmic roll. Italian scores may write rullo or rullo di tamburo; tremolo bars can encode a related repeated-stroke action, but they are graphic notation rather than an abbreviation of the word.
How does rullo sound?
A smooth, sustained, evenly buzzing roll that masks the individual strokes into one continuous sound.
In context
Treccani, Cambridge and Musicca identify rullo with the Italian drum-roll sense. Notation manuals show that percussion rolls may be written with repeated notes or tremolo strokes and must be interpreted for the actual instrument. Rapid repetition and possible sustain remain central, while snare-specific techniques do not define every percussion roll. The word is normally written in full; no stable textual contraction is supported across the independent references.