The concert dates are makeup performances that had been canceled in March, when Joel's management said the singer was suffering from an inflamed vocal cord, a chest infection and laryngitis. The New York Daily News reported there's no doubt John played a role in Joel's decision to check into rehab. John, who had a past history of substance abuse, is said to live a healthier lifestyle now. Billy sees how much healthier Elton is. He's had to cancel concerts because of his throat problem.