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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.
Heavy metal artist Ozzy Osbourne sings the show's theme song, Dog the Bounty Hunter. The song can be heard on Osbourne's Prince of Darkness box set. Many episodes feature at least one song from a band that is either unsigned or with an independent label, usually played during an action scene.