The 1974 Eurovision Song Contest is an important milestone in the history of the competition for several reasons. It was the year that Portugal's entry was used as a signal to start a revolution against the government in what became known as the Carnation Revolution. Former winner Gigliola Cinquetti returned to the competition representing her home country, Italy, whilst Olivia Newton-John flew the flag for the UK. Olivia would later achieve worldwide fame with Grease. However, the night belonged to Sweden and the then unknown group ABBA. The rest of course, as they say, is history.