Espen Lind (also known as Sway, at least here in Norway =p), Askil Holm, Alejandro Fuentes (who sounds a lot like David Gray) and Kurt Nilsen (World Idol winner).
Both Kurt and Alejandro are former Idol contestants. Espen Lind is probably most known for the lovely "When Susanna Cries". Anyways, they really nail this song...had gotten a bit tired of all the versions, but this one certainly didn't hurt=)