Indoor percussion ensemble

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An indoor percussion ensemble or indoor drumline is a type of marching ensemble consisting of battery and front ensemble instruments.^[1][2] It differs itself from a traditional percussion ensemble by not only on musical performance, but on theatrics and marching.^[3] Although most indoor percussion ensembles are affiliated with high schools (also known as scholastic groups), there are also many independent groups that draw participants from a large area and are independently funded.^[4] Independent groups typically start rehearsing in October, while high school groups typically start after their fall marching band season ends. Because of this, the activity is often called winter percussion or winterline.