Sia Rihanna Unstoppable «UHD 8K»

Rihanna recorded it for her 2012 album Unapologetic . Producers: Benny Blanco and Stargate.

This song was released on Sia’s 2016 album This Is Acting . The album's concept was based on songs Sia wrote for other artists (like Adele or Rihanna) that they ultimately passed on. Sia Furler, Christopher Braide. Producer: Jesse Shatkin. Release Date: January 21, 2016. Sia Rihanna Unstoppable

Sia wrote the lyrics and melody for this track in just 14 minutes. Rihanna recorded it for her 2012 album Unapologetic

Rihanna famously mimicked Sia's vocal demo almost exactly, which Sia later said she found incredibly flattering. You can read more about the production on the Diamonds Wikipedia page . Sia Rihanna Unstoppable

This is likely the song you are thinking of, as it is the most famous collaboration between the two.