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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.
Perry the Platypus Theme. This song is by Phineas And Ferb and appears on the Disney soundtrack Phineas and Ferb Soundtrack (2009).