The Norwegian singer Sissel Kyrkjebø is one of my favorites.

Youtube video !B5s4ML4nSso Sissel Wedding of Princess
Youtube video !t97OcL9MOu4 Sissel sang Serenade til Aud in her pianist's wedding Per Kolstad.
Youtube video !lgKn6N697iE Sissel Kyrkjebø: Solveig's Song
Youtube video !kc6S2-NK6B8 Sissel - Wait a While
Youtube video !9eTr6L-0ZoQ Sissel Kyrkjebø - One Day - 2001
Youtube video !pdgZP9Sca2c Sissel - Weightless