(Reuters) - Soul singer Aretha Franklin has pulled out of two upcoming performances because of health issues, the two concert venues said on Monday. Franklin, 71, canceled a May 20 concert with the Chicago Symphony Orchestra and a May 26 solo performance at the Foxwoods Resort Casino in Connecticut. "It was canceled for medical reasons," Foxwoods spokeswoman Dale Wolbrink said, declining to say what health issues caused the "Queen of Soul" to pull out of the May 26 show. ...