It's easy to see Edie Yvonne's story in her latest hit, "Girl Code," even though the scene is full of teen songs. Edie writes about the hard facts and unsaid rules of growing up at a time when life is dangerously balanced between having fun as a child and about to become an adult. That's not like Edie; her skills work just as well on set...

Love Ghost from Los Angeles and Wiplash from Mexico make the best song about heartbreaks in the digital age. They meet in the neon-lit streets of modern music. "Left on Read," their fiery song, is a pop-punk blast that makes the fear of unread letters audible. This song stands out because of its strong notes and steady drum beats. They make me think of the...