Siw Siwan Gunnel Margareta Malmkvist is a Swedish singer who has been popular in Scandinavia and West Germany. She had a number one hit in West Germany in 1964 with Liebeskummer lohnt sich nicht, and on 18 July 1964 she became the first Swede to have a hit on the US Billboard chart, when Sole Sole Sole, a duet with Italian singer Umberto Marcato, enters the chart.
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