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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.
Luckily, the answer is just as simple as the question itself is â and the singer may be just as recognizable as the show itself is, as well. Regina Spektor is behind the show's theme song track, which is titled You've Got Time..