Sissel Kyrkjebø (born June 24, 1969 in Bergen, Norway), also known as just Sissel, is a Norwegian singer. She is best known for singing the Olympic Hymn (Hymne Olympique) at the Opening and Closing Ceremonies of the 1994 Winter Olympic Games in Lillehammer, Norway, for duets with Plácido Domingo, Charles Aznavour, José Carreras, Neil Sedaka, Warren G, Josh Groban, Russell Watson, and The Chieftains, and her participation on the Titanic film soundtrack.
Sissel is considered one of the world's top crossover sopranos. Sissel's musical style runs the gamut from pop recordings and folk songs, to classical vocals and operatic arias. She possesses a crystalline voice and wide vocal range, sweeping down from mezzo-soprano notes, in arias such as Mon c?ur s'ouvre à ta voix from Saint-Saëns's opera Samson et Dalila, to the D flat above soprano C.