Tremolo is a musical term used to describe a rapid, pulsating change in volume or pitch. It is often confused with VIBRATO, which is a similar effect but with a slower rate of change. The crossword solutions for tremolo are 'ROLL' (4 letters) and 'VIBRATO' (7 letters). ROLL is a term used to describe a rapid repetition of notes, while VIBRATO is a technique used to create a wavering effect on a single note. Both techniques are used to create a tremolo effect.