'Unbreakable' languished in vault for two years

Although Unbreakable is proving to be another hit for Alicia Keys, the song spent about two years in her vault before she decided to record it.

Unbreakable, which is on her new Unplugged album, was intended for 2003's The Diary of Alicia Keys.

"It's always been one of my favourite songs but it just didn't fit properly with the second album, so, I kind of put it on the shelf waiting for the perfect time," Keys said.