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Cover of Dr. Horrible's Sing Along Blog: The Book.

Dr. Horrible's Sing-Along Blog: The Book was published by Titan Books on March 29, 2011. The book serves as a behind-the-scenes tie-in to Dr. Horrible's Sing-Along Blog. It contains essays by Dr. Horrible director Joss Whedon and stars Nathan Fillion, Neil Patrick Harris, Felicia Day, and Simon Helberg, as well as the complete shooting script, the script for Commentary: The Musical, and piano/vocal sheet music for Dr. Horrible.[1]