A previously unreleased song sung by singer of song Britney Spears has appeared on the internet.
The song is question is called 'Unbroken'.
According to MuuMuse, a song with the same title was listed on the BMI website as a Fraser T Smith production, which would date it around the 'Femme Fatale'-era.
(It's sort of too good to be from the 'Britney Jean' 'sessions', to be honest.)
Anyway, here it is.