It’s an old story, one that’s happened over and over again. An unknown act comes out of nowhere with a song that catches on in a huge way. And then boom: Before you know it, Drake jumps on a remix. The effect tends to be symbiotic. The artist gets a big boost from the Drake cosign, and Drake gets to turn the whole thing into a story about himself. Everyone rides everyone else’s wave. The latest beneficiary of the Migos Effect is 4batz, a 20-year-old singer from Dallas with a three-song discography.