1.ABBA is a legendary Swedish pop group formed in Stockholm in 1972 by four members: Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad. The name "ABBA" is an abbreviation derived from the first letters of each of their names. The band is known for their Euro-pop disco tunes, and dancing, which also incorporate elements of rock, and traditional Swedish folk music. They rose to a global fame when they won the 1974 Eurovision Song Contest with their iconic song "Waterloo", and later created the hits Mamma Mia and Dancing Queen, etc. 2．ABBA has sold over 400 million records worldwide at the peak of their career, demonstrating their immense impact on music. What is unforgettable is that they were two couples who once loved each other and later were separated. However, this did not hinder their later collaboration in music. 3.In 2023, they came back together with ABBA Voyage. They held 374 concerts, with the support of AI, animation，holographic projection technology, contributing $410 million to London's economy. 4. Even though in their 70s, they brought to the audience their former glory, their talents,and beautiful memories. The "Happy New Year" sung by the four of them 40 years ago has become a beautiful moment in history.