Semisonic is an American rock band featuring Dan Wilson, John Munson and Jacob Slichter. They are perhaps best known for their 1998 single "Closing Time".
Dan Wilson provides his own voice in singing "Closing Time" at the 90s Fest in "The Witches of Langley". When he objects to Steve lurking backstage in preparation of enslaving everyone, Steve uses his witchcraft power to explode his head.