In the 1970's a song by Tony Orlando and Dawn, became very popular called, 'Tie a Yellow Ribbon Round the Old Oak Tree'.

http://www.youtube.com/watch?v=H4cyCuj3H9I ; (Child safe video with lyrics.)

http://www.youtube.com/watch?v=wWn1Oj2V7Xw ; (Caution: You may die from laughing video.)

Within months, I began seeing yellow ribbons tied around trees, while driving. Over time, people began leaving flowers or flags, as a makers of an accident or special occasion. This song added an element to our American life.

The Question: Is there a song in your country which impacted your society like this...? (Please give a url.)