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In page ABBA:

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By 1978, ABBA were one of the biggest bands in the world. They converted a vacant cinema into the Polar Music Studio, a state-of-the-art studio in Stockholm. The studio was used by several other bands; notably Genesis' Duke, Led Zeppelin's In Through the Out Door and Scorpions's Lovedrive were recorded there. During May 1978, the group went to the United States for a promotional campaign, performing alongside Andy Gibb on Olivia Newton-John's TV show. Recording sessions for the single "Summer Night City" were an uphill struggle,[citation needed] but upon release the song became another hit for the group. The track would set the stage for ABBA's foray into disco with their next album.[1]