<P> In 2005, all four members of ABBA appeared at the Stockholm premiere of the musical Mamma Mia! . </P> <P> On 22 October 2005, at the 50th anniversary celebration of the Eurovision Song Contest, "Waterloo" was chosen as the best song in the competition's history . </P> <P> On 4 July 2008, all four ABBA members were reunited at the Swedish premiere of the film Mamma Mia! . It was only the second time all of them had appeared together in public since 1986 . During the appearance, they re-emphasised that they intended never to officially reunite, citing the opinion of Robert Plant that the re-formed Led Zeppelin was more like a cover band of itself than the original band . Ulvaeus stated that he wanted the band to be remembered as they were during the peak years of their success . </P> <P> The compilation album ABBA Gold: Greatest Hits, originally released in 1992, returned to number - one in the UK album charts for the fifth time on 3 August 2008 . On 14 August 2008, the Mamma Mia! The Movie film soundtrack went to number - one on the US Billboard charts, ABBA's first US chart - topping album . During the band's heyday the highest album chart position they had ever achieved in America was number 14 . </P>

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