Armenia's entertainment culture is anchored by a classical music tradition of unusual depth for the country's size. The Yerevan Opera Theatre, founded in 1933, maintains a full opera and ballet season. The Yerevan International Music Festival and the Armenian State Symphony Orchestra's season give the capital a classical entertainment circuit that reflects the country's long musical education tradition. The Vardavar summer water festival — when communities drench each other with water on the day marking the transfiguration of Christ, an echo of a pagan water goddess celebration — is the most joyful public entertainment event in the country. The duduk double-reed instrument performances — UNESCO-listed and a sound that UNESCO describes as among the most beautiful in the world — are heard at weddings, festivals, and dedicated concert evenings across the country.