It's safe to say that Darren Criss' debut on "Glee" went well. There are reports that he's set to become a regular in the cast, and the song he performed in Tuesday's episode is set to have a huge debut on the music charts as well.
According to Billboard, his version of Katy Perry's "Teenage Dream" set a single-day sales record for a "Glee" song on iTunes, logging 55,000 downloads in its first day. The song is forecast to sell between 150,000 and 175,000 copies by the end of the week.
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