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Members of the Mark de Lisser singers preform the iconic ABBA song 'Waterloo' at Waterloo Station in London, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alastair Grant)
Members of the public watch a performance by the Mark de Lisser singers of the iconic ABBA song 'Waterloo' at Waterloo Station in London, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alastair Grant)
Members of the Mark de Lisser singers preform the iconic ABBA song 'Waterloo' at Waterloo Station in London, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alastair Grant)
Members of the Mark de Lisser singers preform the iconic ABBA song 'Waterloo' at Waterloo Station in London, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alastair Grant)
FILE - In this April 6, 1974 file photo, Swedish pop group ABBA celebrate winning the 1974 Eurovision Song Contest on stage at the Brighton Dome in England with their song Waterloo. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Robert Dear, File)
Members of the Mark de Lisser singers preform the iconic ABBA song 'Waterloo' at Waterloo Station in London, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alastair Grant)
People dressed in costumes take part in a silent disco event outside the Brighton Dome, in Brighton, England, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alberto Pezzali)
People dressed in costumes take part in a silent disco event outside the Brighton Dome, in Brighton, England, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alberto Pezzali)
A woman holds an ABBA scarf, during a silent disco event outside the Brighton Dome, in Brighton, England, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alberto Pezzali)
People dressed in costumes take part in a silent disco event outside the Brighton Dome, in Brighton, England, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alberto Pezzali)
A man gestures to the ABBA blue plaque as people take part in a silent disco event to celebrate the 50th year anniversary since ABBA won the Eurovision Song contest, outside the Brighton Dome, in Brighton, England, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alberto Pezzali)
People take part in a silent disco event outside the Brighton Dome, in Brighton, England, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alberto Pezzali)
FILE - Members of Swedish group ABBA and close associates celebrate the victory of their song "Waterloo" in the Eurovision Song Contest in Brighton, England, April 6, 1974. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/File)
People dressed in costumes take part in a silent disco event outside the Brighton Dome, in Brighton, England, Saturday, April 6, 2024. Fans are celebrating 50 years since ABBA won its first big battle with “Waterloo.” A half century ago on Saturday, April 6, the Swedish quartet triumphed at the 1974 Eurovision Song Contest with the peppy love song. (AP Photo/Alberto Pezzali)