Blake Shelton is stepping away from his 20-year-plus label partnership with Warner Music Nashville. In a statement on Tuesday (Sept. 3), Shelton expressed his gratitude for his longtime label home, as well as Giant Records, which served as the original home base for his hit debut single “Austin” in 2001. “I moved to Nashville when I was 17 to sing country music and get a record deal,” the star states. “Along with the support from Warner, my dreams came true, and then some. It’s impossible to name everyone who has had a hand in all the success we enjoyed, but a huge and heartfelt thank you to t…