The Wanted's Nathan Sykes on Going Solo and Reinventing His Sound

Nathan Sykes, of U.K. boy band the Wanted, got a phone call from his mother about 10 minutes after tickets went on sale for his first U.S. solo date. She was concerned that the website had crashed.

“She was like, ‘Nathan, I’m really worried,'” he recalls with a laugh. “She said, ‘I…