"Happy New Year" is a popular song by Swedish pop group ABBA from their 1980 album Super Trouper. The lead vocals are by Agnetha Fältskog.
Although recorded in 1980, the English-language song wasn't released as a single until 1999 and charted at no. 34 in Sweden, no. 15 in the Netherlands, no. 75 in Germany, to promote the CD re-release of many of ABBA's singles.
And today, many countries around the world play this song at 12 am every year when welcoming a new year which makes it the most popular new year's song.