It’s safe to say that The Voice has gotten off to a roaring start. It’s the top-rated new series in the coveted 18-to-49 demographic, and it’s no wonder NBC is expanding it to two-hour live episodes in June. Everybody expected a flimsy American Idol knock-off. But instead, The Voice has turned out to be a brilliant surprise. The ingenious team format pumped new life into the singing-contest formula, from the blind auditions to the cage-match sing-off duets. It has the excitement and sparkle of a true pop event.