Soundtrack
The musical contains 14 songs, including credits and reprises, but at the time of broadcast the song titles were not identified. The soundtrack was released through the iTunes Store on September 1, 2008 and was released on CD in the US on December 15, 2008.
Dr. Horrible's Sing-Along Blog Soundtrack made the top 40 Album list on release, despite being a digital exclusive only available on iTunes.
Read more about this topic: Dr. Horrible's Sing-Along Blog