A trill is a musical ornament that involves rapidly alternating between two adjacent notes, typically a step apart. This technique adds expressiveness and embellishment to melodies, often found in classical music and various genres. Trills can be played on instruments like the flute, violin, or piano, and are also used in vocal performances. In written music, trills are usually indicated by the symbol "tr" above the note where the trill begins. Musicians interpret trills with different speeds and styles, depending on the piece and the composer's intent. Mastering trills can enhance a musician's technical skills and overall performance.