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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.
The superb theme tune and series music was written by Mungo Jerry's Ray Dorset. Episode 1 The P to S Day-Billy and Pincy set up a dating agency and burglar alarm company but as ever seem to spend their time getting out of scrapes. Aired date: Feb 19, 1986 Channel 4. FOR EDUCATIONAL PURPOSES ONLY.