Mabel is set to make it. BIG. Her debut album, "High Expectations," dropped earlier this year, and 146 million views later, her lead single, "Don't Call Me Up," is one of our favorite things on the web. She's in the thick of a European tour, but still found time to give Song Association a go. Tune in to see her sing pop tunes from Rihanna, Beyoncé, and more.