Yes, his blood runs Canadian. But has anybody better embodied the spirit of ?classic American rock ?& roll than Neil Young? Americana is a flashback in more ways than one: Not only does it reconvene Young’s proto-grunge backing band Crazy Horse ?for the first time since 1996, but it also consists of reworkings of Dust Bowl-era folk tunes. Young clearly loves jamming with his favorite fuzzmongers again — there’s an unbridled glee that oozes between the blistering solos on sneering, sideways renditions of campfire sing-alongs like ”Oh Susanna” and ”This Land Is Your Land.” Even on the 66-year-old’s 34th album, Young still has fire in his belly and fun in his fingers. A?