At 0.07, London time on 5 October, the beginning of Global James Bond Day, the SkyFall theme song by Adele was released on Adele's website.

Adele's website was counting down to the moment the song was released, but just before the official release, the song was leaked online by a French radio station.

After reading the script for the film, Adele enlisted Paul Epworth to co-write and produce the theme song to SkyFall. Adele admits, “I was a little hesitant at first to be involved with the theme song for SkyFall. There’s a lot of instant spotlight and pressure when it comes to a Bond song. But I fell in love with the script and Paul had some great ideas for the track and it ended up being a bit of a no-brainer to do it in the end. It was also a lot of fun writing to a brief, something I’ve never done which made it exciting. When we recorded the strings, it was one of the proudest moments of my life. I’ll be back combing my hair when I’m 60 telling people I was a Bond girl back in the day, I’m sure!” Recorded at Abbey Road Studios in London, “SkyFall” features the lush accompaniment of a 77-piece orchestra.

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http://www.jamesbondlifestyle.com/news/skyfall-theme-song-adele-released