Otis, in this context, is referring to Otis Redding, a soul singer. Otis Redding was an influential American singer, songwriter, and record producer known for his smooth and emotive voice.
Note: The provided meaning of the answer is for the latest New York Times crossword puzzle clue: ___ Day and the Knights, band that performs "Shout" in "Animal House". Explanations are generated by AI and may be inaccurate.