Nielsen's "Undo" was her breakthrough international hit, achieving widespread success after her third-place finish at the Eurovision Song Contest 2014. The track became a staple of European dance-pop radio that summer.
- "Undo" was written by Fredrik Kempe and David Kreuger.
- The song reached number one on the official Swedish singles chart and charted in several other European countries.
- It was included on Nielsen's 2014 album "7", which also debuted at number one in Sweden.
Sanna Nielsen is a Swedish pop singer from Bromølla, known for her participation in Melodifestivalen. She has been a consistent presence in Swedish pop music since the late 1990s. In 2014, Nielsen was at a career high following her Melodifestivalen win and subsequent Eurovision participation.
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