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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.
Background Information.  1 Gitchee Gitchee Goo, the show's theme song, and Perry the Platypus were the first songs written for the series. 2  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.