Singer/guitarist Jared Leto explained to Musicradar.com
that this song very nearly didn't make the album. He said: "Actually, we were going to throw this song out, but we decided to keep it. It was hard to mix, a total pain in ass, but I'm glad it made the record because I think it fits in with the overall framework of the album.
The song is a mission, an adventure that takes you on a journey. Maybe that's why it gave us so much trouble: We had go on an adventure as a band to get it right. Some songs come very easily and other ones fight you. Oftentimes, the ones that give you trouble turn out to be the best ones - this is an example of the latter."