1A-4A and 5A-6A are broken up into two separate "shows", for lack of a better term. Each grouping gets 7 finalist spots: 1A-4A class winners, plus the next three highest scoring bands in that grouping. 5A-6A class winners, plus the 5 next highest scoring bands in 5A-6A.
3A: Marian Catholic
Next 3 highest scoring bands: Romeoville, Galesburg, Bloomington
6A: Lockport Township
Next 5 highest scoring bands: Lincoln-Way, VJA, Edwardsville, Plainfield North, H.D. Jacobs
Finalists are then randomly drawn into two groupings: bottom 4 scoring bands from 1A-4A/bottom 3 scoring bands from 5A-6A, (break), top 3 scoring bands from 1A-4A, top 4 scoring bands from 5A-6A.