Christel Martina Roosberg (née Sundberg; born 3 January 1982),[1] known by her stage name Chisu (Finnish pronunciation: [ˈkisu]), is a Finnish pop artist, songwriter, and producer.

She wrote her first single, "Mun koti ei oo täällä", to the soundtrack of the 2007 film Sooloilua.

It was met with significant commercial success and became one of the best-selling albums of all time in Finland by a Finnish artist, selling approximately 95,000 copies.

[citation needed] During her career, Chisu has sold over 230,000 certified records, which places her among the top 80 best-selling artists in Finland.

[3] In November 2012, Chisu was connected to a copyright controversy in Finland when a nine-year-old girl's home was raided by the police and had her laptop confiscated due to allegedly downloading Chisu songs.