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Thomas Gustafsson (born 25 February 1968), known professionally as Thomas G:son, is a Swedish composer and musician born in Skövde, Västergötland.
He is best known for the 117 songs he has written for the national selections of 12 countries for the Eurovision Song Contest: 74 for Sweden, 16 for Spain, six for Norway, five for Denmark and Finland, three for Georgia, two each for Poland and Malta, and one each for Cyprus, Latvia, Romania, Belgium and Lithuania. He will reach the milestone of 70 entries at Melodifestivalen at the 2024 edition. His songs have also reached the Eurovision Song Contest 15 times: four times for Sweden, three times each for Spain and Georgia, twice for Cyprus and once each for Norway, Denmark and Malta. In 2012, G:son achieved his first victory as a winning composer at the Eurovision Song Contest with "Euphoria", performed by Loreen. With the same artist in 2023, he won the contest for a second time.
Gustafsson has been a full-time songwriter since 1998. In addition to writing and composing songs in various genres for a living, he is the guitarist of the hard rock band Masquerade.