The series premiered on September 14, 2002, and ran for three seasons before ending on July 21, 2006. The title song was performed by Canadian band Simple Plan. Reruns of the series have aired on both Cartoon Network and Boomerang in the United States. It also aired on Teletoon in Canada, and CITV in the United Kingdom.\n\nWho sings the what's new scooby doo theme song? Let's have some stream of consciousness first.
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The relevant information to answer the above question is: The title song was performed by Canadian band Simple Plan. So, the answer is Canadian band Simple Plan.
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