Un
There is more than one band with the name UN (or Un).
1) Un was a group featuring Marcia Bassett (Zaimph, Double Leopards, Hototogisu, GHQ, among others), Grant Acker, and Tom Roach, formed in Philadelphia around 1995. Tara Burke (later of Fursaxa) also joined at one point and they had two releases on the Siltbreeze label before disbanding in 1999.
2) UN (유엔) is a male duo from Korea. Although their music is a mix of different genres, most of their songs are predominantly pop ballads with a twist of R&B.