Dre London knows to trust his gut feeling when he thinks he’s struck gold. He felt it with Post Malone, the genre-bending, global superstar whom London met in 2014 while visiting a house in Encino, California, full of burgeoning, young creatives. He eventually moved into that house and began managing Malone months later, resulting in three multi-platinum albums, four Billboard Hot 100 No. 1s and nine Grammy nominations in the following years. London felt it again while working on his own premium tequila, Don Londrés, which he launched in the U.S. this month. “I’d never tasted anything like it before. And it was the same way when I heard Post Malone: I’d never heard anything like it before,” he tells Billboard. “It had that first-time gut feeling of, ‘Woah, am I onto something right here? I...