In what month was the Rihanna song that Mikky Ekko is best known for being featured on released?
Mikky Ekko:  He is best known for being featured on Rihanna's 2013 single "Stay", which has charted in multiple countries worldwide, becoming Ekko's first-charting material. Stay (Rihanna song):  It features guest vocals by Mikky Ekko, and was released as the second single from the album on January 7, 2013.
January