scatter band n. a group of musical performers, without traditional marching band structure, that perform unorthodox skits and songs at university sporting events. Etymological Note: The term originates in the way such groups tend to enter for performances: as a disorganized mob, screaming and running about. (source: Double-Tongued Dictionary)
Further reading
Understanding the varieties of conversational styles can mean the difference between feeling you’re understood and being insulted. “High-involvement” speakers interrupt or talk along with someone else to signal their enthusiasm...
There was a time when William Shakespeare was just another little seven-year-old in school. Classes in his day were demanding — and all in Latin. A new book argues that this rigorous curriculum actually nurtured the creativity that later flourished...
The term “scramble band” is also used; it may be more commonly associated with the Ivy League bands (except for Cornell).