"Dancing Queen" is a Europop and disco song by the Swedish group ABBA, released as the lead single from their fourth studio album, Arrival (1976). It was written by Benny Andersson, Björn Ulvaeus and Stig Anderson. Andersson and Ulvaeus also produced the song. "Dancing Queen" was released as a single in Sweden on 15 August 1976, followed by a UK release and the rest of Europe a few days later. It was a worldwide hit. It became ABBA's only number-one hit in the United States and topped the charts in Australia, Canada, the Netherlands, Belgium, Ireland, Mexico, New Zealand, Norway, South Africa, Spain, Sweden, the United Kingdom, West Germany, and Rhodesia. "Dancing Queen" also reached the top five in many other countries.

Source: Wikipedia