Neil Young fans are still reeling from last week's incredible four-night stand at Carnegie Hall. For reasons that remain unclear, Young devoted the vast majority of his solo acoustic set to his earliest work, with a special emphasis on Harvest, After the Gold Rush and tunes from Buffalo Springfield. Many of the songs had been unplayed for years, and the performances were breathtaking. The ushers at Carnegie Hall were more vigilant than usual about cameras and were quick to shine a flashlight on anybody filming, but fans still managed to flood YouTube with videos. Here are 10 must-see highlights. By Andy Greene