Tremolo is a musical technique that involves the rapid repetition of a single note or the quick alternation between two notes. It creates a wavering or shaking sound, adding expressiveness to music. Tremolo can be produced on various instruments, including the guitar, violin, and piano, and is often used in both classical and contemporary compositions. In addition to its use in instrumental music, tremolo is also a common effect in audio production. It can be applied to vocals or other sounds to create a dynamic texture. Musicians and producers often use tremolo to enhance the emotional impact of a piece, making it more engaging for listeners.