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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.
Gitchee Gitchee Goo, the show's theme song, and Perry the Platypus were the first songs written for the series. The song may have been inspired or may be a parody of Secret Agent Man, a song sung by Johnny Rivers as the theme song to the 1960s British television series Danger Man.