___ Day and the Knights, band that performs "Shout" in "Animal House" (4)
I believe the answer is:
otis
(Other definitions for otis that I've seen before include "---- Redding, 1941-67, soul singer" , "Cole Porter's miss who was "unable to lunch today"" , "-- Redding, US singer" , "lift company" , "Lift man" .)