Here are three versions of Halalaya (first version is very old)
http://www.youtube.com/watch?v=EaH6DxHF_NM
http://www.youtube.com/watch?v=BLzH2ApSjQg
http://www.youtube.com/watch?v=J4gmnIcO6Fg
Does anyone know of any Greek singer who has recorded this song?