Forensics Of A Song

There have got to be more writings like this one in the world. But for now, this is the most in-depth play by play investigation of  a Dr. Luke produced track I have yet to uncover:

http://musformation.com/2009/03/forensics-of-a-song-katy-perry-hot-n-cold.html

In addition, this is the most in-depth interview I have found. It even discusses the magical moment when he and Max Martin were listening to “an indie rock song” together and got the idea for “since u been gone”:

http://www.billboard.com/features/dr-luke-the-billboard-cover-story-1004112877.story#/features/dr-luke-the-billboard-cover-story-1004112877.story

But what song was it???