While many songs on this album were intended for others, Sia has not publicly confirmed if "Unstoppable" was specifically written for Rihanna. "Diamonds" by Rihanna
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
Sia wrote the lyrics and melody for this track in just 14 minutes. While many songs on this album were intended