In the afternoon, sunlight pours golden over the corn hills of in Nghia Dong Commune, western Nghe An. Amid the stillness of the mountainous commune, children’s voices rise in song. Not lively pop music, but the rustic melodies of Vi and Giam. In the small courtyard of the home of Tran Thuy Nga, dozens of children sit around Meritorious Artisan Ngo Minh, attentively following each rhythm of the singing.