SEASON FINALE: Part 1 of 2.  Tonight the finales of Idol and The Voice go head to head, which ought to be interesting, at least in terms of after-the-fact network boasting. But for now, in this first half of a two-part finale, The Voice presents its four finalists, who sing one last time to fight their way to tomorrow night’s winner’s circle. First-time judge Kelly Clarkson has one representative, Brynn Cartelli, still standing, while the show’s most victorious judge, Blake Shelton, has two: Kyla Jade and Spensha Baker. The fourth finalist, voted in after a win-or-go-home performance, is Britton Buchanan, representing judge Alicia Keys. Which means, for this cycle of The Voice, one person who has no chance at all of winning is… judge Adam Levine.