Question: What song from Rihanna's album "Unapologetic" did pianist Tokio Myers play in semi-final 3 of the 2017 reality show "Britain's Got Talent"?
Sentence (from "Diamonds (Rihanna song)"): "Diamonds" is a song recorded by Barbadian singer Rihanna for her seventh studio album, "Unapologetic" (2012).
Relevant evidence: Yes