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
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The term “scramble band” is also used; it may be more commonly associated with the Ivy League bands (except for Cornell).