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Congratulations: 50 Years of the Eurovision Song Contest was a special television program organized by the EBU, which took place on October 22, 2005 to commemorate 50 years of the Eurovision Song Contest.
The show was hosted by Katrina Leskanich (of Katrina and the Waves, the winner of the Eurovision Song Contest 1997) and Renārs Kaupers (of Brainstorm, third place at the Eurovision Song Contest 2000).
The winning song of Congratulation was Waterloo by the Swedish group, ABBA, who won the contest in 1974.