"The Big Bang Theory Theme song" is wrote and recorded by the Canadian alternative rock band Barenaked Ladies, which describes the history and formation of the universe and the Earth. Ed Robertson, lead singer and guitarist in the band, was asked by Lorre and Prady to write a theme song for the show. Having been asked to write songs for other films and shows only to have them rejected in favor of another artist's, Robertson agreed to write a theme only after learning that he was the sole writer whom Lorre and Prady had asked. He drew inspiration from Simon Singh's book, Big Bang, which he had coincidentally just finished reading.
On October 9, 2007, a full-length (1 minute and 45 seconds) version of the song was released commercially. Although some sources identify the song title as "History of Everything", the cover art for the single identifies the title as Big Bang Theory Theme. A music video was also released via special features on The Complete Fourth Season DVD and Blu-ray set. The theme was included on the band's greatest hits album, Hits from Yesterday & the Day Before, which was released on September 27, 2011.
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