Which term describes the rapid repetition of a single tone?

The rapid repetition of a single tone is accurately described by the term "tremolo." Tremolo involves quickly alternating the same note, which creates a shimmering effect in music. This technique can be executed vocally or instrumentally, and is often used to intensify emotional expression in a piece.

In contrast, a trill involves a rapid alternation between two adjacent notes, rather than repeating the same pitch. An arpeggio refers to the notes of a chord played in a sequential manner, usually from the lowest to the highest note. Staccato is a style of playing that involves detaching the notes, making them sound short and distinct from each other, rather than repeating a single note. Understanding these distinctions clarifies the specific terminology used in the context of musical techniques.