Crotchet was a female mouse member of the Traveling Thistledown Troupe. Along with Quaver and Queenie, she was a part of the Melodious Mice, a trio of mouse singers under the leadership of Hypericum Hadduck Hare.
The Melodious Mice opened the performance of the troupe during the Redwall Abbey feast which celebrated the last day of Autumn. The mice were great singers and had performed at many harvest fairs and twice at banquets.