Question: Michael Len Williams II  is best known for producing trap beats for several Southern hip hop artists as well as for producing several singles, such as which song by Barbadian recording artist Rihanna from her seventh studio album, "Unapologetic" (2012)?
Sentence (from "Diamonds World Tour"): The tour was announced in September 2012 following the singer's performance at the 2012 MTV Video Music Awards.
Relevant evidence: No