Watch Amy Winehouse Murder 'Back To Black' In This Studio Clip From 'Amy'

Amy works with Mark Ronson in this candid, behind-the-scenes video.

If you've ever wondered how the sexy, devastating "Back to Black" became the title track for Amy Winehouse's second studio album, this clip from Asif Kapadia's documentary, "Amy," will show you the moment at which music history was made.

A video from the singer's recording session with Mark Ronson shows her laying down vocals on "Back to Black," in what looks like one perfect take.

It's amazing to watch Amy work, especially in a candid moment at the end where an artistic flourish on the instrumental track takes her by surprise. But even better is the rare chance to hear the song in this raw form: No reverb, no instruments, just Amy and her iconic voice.