The language rule forcing countries to enter songs sung in any of their national languages was dropped, so performers from some countries sang in English. The event was marked by controversy when the Spanish song, "Eres tú" (by Mocedades), was accused of plagiarism due to reasonable similarities in the melody with the Yugoslav entry from the 1966 contest ("Brez besed" sung by Berta Ambrož); however, "Eres tú" was not disqualified. After finishing second in the contest, the song went on to become a huge international hit.