ABBA
In 1976, ABBA released "Dancing Queen", which is often known as ABBA's "signature song" and "one of the greatest pop songs ever written".  During 1977, their huge popularity became known as "Abbamania".  In Australia, ABBA played in huge concerts that usually always sold out.  "ABBA: The Movie" was also released in 1977 during the height of the group's popularity. Throughout the mid and late 1970's ABBA performed in Europe, The United States, Japan and Australia.