Tonight at 9 ET, the invaluable PBS arts documentary series American Masters presents its latest offering: "LennoNYC", an examination of John Lennon's final, New York City years. It's not comprehensive, but it does contain some rarities and solid insights -- and whether or not you're a diehard Beatles fan, it's well worth watching. And hearing. Especially hearing, because the outtakes and acoustic versions of Lennon songs are treasures in themselves...