CREATE TABLE table_name_51 (jury VARCHAR2, singer VARCHAR2)

Kostas Bigalis & Mirella Fragkopoulou the singer had what has the jury?
SELECT jury FROM table_name_51 WHERE singer = "kostas bigalis & mirella fragkopoulou"
SELECT "jury" FROM "table_name_51" WHERE "kostas bigalis & mirella fragkopoulou" = "singer"