Earlier this month, Selena Gomez posted a photo of herself and Nigerian singer Rema on Instagram, captioned: “This man has changed my life forever. Rema, thank you for choosing me to be a part of one of the biggest songs in the world. Love you forever.” You have definitely heard the song in question—’Calm Down‘. With over 500 million views on YouTube, the track’s success is not a one-off phenomenon, but part of a more significant, growing trend. Steadily climbing the charts and solidifying itself in the public consciousness is a…