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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.
1 For Shawn 2.0 (5.08) Curt Smith recorded a version of the song. 2  Julee Cruise, who sang the theme for Twin Peaks, sang the song for the Twin Peaks inspired episode Dual Spires (5.12).  For The Amazing Psych-Man & Tap-Man, Issue 2 (6.04) a superhero-themed version was used.