' (former spelling ') is a style of Cornish-Celtic dance, and associated music and events similar in style to the Breton but featuring only Cornish dances. is Cornish for 'happy night'.
 is a relatively recent development in Cornish music and dance, which started in the 1990s, some twenty years after the beginning of the revival of Cornish dancing generally. It may be a reaction to the more formal approaches of the earlier revival, in which the social dance night, known as the , presented the Cornish dances in the style of a Scottish or Irish . The approach on the other hand was inspired by the Breton format, which itself had emerged in the 1960s. Both and were new ways of celebrating what were often quite ancient dances from their respective regions. was initially spearheaded by the Cornish group Sowena, and traditional dancers. It places greater emphasis on simpler dances, which are also often the oldest ones, such as snake dances and furry dances, in order to increase participation and remove the need for a caller. The movement continues to enjoy much success in Cornwall as does the approach.
While is essentially a dance style, an associated style of music has grown around it which is generally more progressive than many folk bands, possibly to appeal to a younger audience. It also places more emphasis on rhythms and longer songs in order to produce the tribal trance-like state associated with the repetitive dances. Proponents include Tredanek, Dalla, Davey &amp; Dyer, and Heb Mar.
The proper Cornish plural of is , but people often simply say "nos lowens" when speaking English, in the same way people might pluralise "ceilidhs" in English. is sometimes abbreviated as "nsl" online or in event listings. The earlier spelling was based on the Late Cornish orthography; with the introduction of the Standard Written Cornish, the spelling is now used.
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