This interview features researcher Nguyễn Đắc Xuân sharing insights about his journey in collecting and studying the music and heritage of Trịnh Công Sơn. The conversation delves into Xuân's research journey and his efforts to rediscover "Tiếng hát dã tràng," Trịnh Công Sơn's longest composition. Originally created for a music event at Quy Nhơn Teacher's College, the song was lost over time. Nguyễn Đắc Xuân attempted to reconstruct it by inviting former choir members to sing individual segments, but this effort failed. Eventually, he met a friend who, by chance, still possessed a copy of the song, leading to its rediscovery.