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The first episodes of Zero Punctuation were originally uploaded to YouTube by the series' creator Ben "Yahtzee" Croshaw, where they quickly drew attention from the video games community. Shortly afterwards, The Escapist contacted Croshaw and employed him to make more videos for their website.
Initially, the episodes featured different music each week during the introduction and credits. However, in July 2008, the title sequence was remade, and featured a new theme tune which has been used on every episode since.

Source: Wikipedia