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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.
About 10 seconds prior to this the boys are chanting Kyrie Elieson (Lord, have mercy in Greek)...I'm guessing the writers picked that up from the Mister Mister song and thought it sounded mystical for this scene. ;) Funny pictures about Psych Really Understands My Struggle. Oh, and cool pics about Psych Really Understands My Struggle.