ASEAN music education is important for learning the history, culture, beliefs, and identities of each member country; this research aims at studying the revival and development of Lao classical songs: 'Oh Lao' and 'Platong', no longer played. From the research results, the symposium of music teachers and experts including national artists was organized to exchange the idea to develop the melody played by alto xylophone and further developed by creating harmonies for performance by the string orchestra according to the principles of international music theory, composing and anthropological theories.