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The theme song to Psych, I Know, You Know, is performed by series creator Steve Franks and his band, the Friendly Indians. WIKI. You can download the MP3 from the link I am providing. These lyrics were all I could find off of someone's blog.
On May 8, 2017, USA Network announced Psych: The Movie, a 2-hour TV movie to air in December 2017. All the original main cast will return for the TV movie, which will be directed by series creator, Steve Franks, and screenplayed by Franks and series star, James Roday.