Ca tru is ancient genre of chamber music in Vietnam. It is a cultural heritage of Vietnamese; it was existed 1000 year within the histories of Thang Long- Hanoi. Ca tru used to be performed in imperial palace, mandarin’s official, and wealthy family.

Marianne Brown opens her ears to the haunting sounds of ca tru at the first-ever theatre dedicated entirely to this 11th century chamber music.

The Thang Long Royal Citadel has been named a World Heritage site by UNESCO, the UN cultural and scientific body, according to a statement on the government website Sunday.