But from 1966 to 1973, and then again from 1977 to 1998, a rule was put in place stating that countries could only perform their songs in one of their official languages.
У перыяд з 1966 па 1973 год і з 1977 па 1998 год краінам дазвалялася выконваць песні толькі на іх роднай мове.