one interesting thing about 1968. the winner song, Spain's Massiel - La, La, La certainly has lots of la la la in it. https://y.com.sb/watch?v=SEfilnmFMlU&list=PL329BA020EE9CD7B2&index=14
and not only that, because right after it Germany's Wencke Myhre - Ein Hoch Der Liebe gives us another load of la la la https://y.com.sb/watch?v=SnDbsHRCkVc&list=PL329BA020EE9CD7B2&index=15
this is probably where this finnish song ”Life is like eurovision” by Leevi and the Leavings from 2000 got its inspiration https://y.com.sb/watch?v=-tfiDer_ASA