Wikipedia
Wanvun
Wanvun, literally "chorus", is a style of singing used by Kashmiri Pandits before certain rituals such as Yagnopavit and marriages. It can also be used to describe a music session at which traditional songs are sung.
In the 1980s, the Indian Council for Cultural Relations expressed concern that as modern marriages were using songs from movies, there were less old people singing the traditional wanvun. In some places, wanvun is sung to celebrate the end of Ramadan.