In recent years, Tami Neilson has been learning to carry both great joy and great sorrow simultaneously. The New Zealand-based, Canada-born powerhouse’s new album, ‘Neon Cowgirl,’ is named after the towering electric figure on a sign that’s overlooked Broadway in Nashville, watching over Tami’s career since she was 16 years old. The songs were born from a five-month family road trip combined with a major musical tour that would allow Tami the once-in-a-lifetime chance to really give it her all…