Har Mar Superstar
Sean Matthew Tillmann , better known by his stage names of Har Mar Superstar and Sean Na Na, is an American singer.
Tillmann was born in Marshall, Minnesota, on February 6, 1978. In 1987, his family moved to Owatonna, Minnesota. He graduated from the Perpich Center for Arts Education in Golden Valley, Minnesota. His family is still based in Owatonna, where his mother and father work as educators.
Source: Wikipedia