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© EBU/Andres Putting About Quick Facts MembersCorinne ‘Co’ GfellerStefan ‘Stee’ Gfeller Founded2008 Nationality???????? Swiss National SelectionDie Entscheidungsshow 2018 In Eurovision2018 Lisbon SongStones (2018) Biography Co and Stee are brother and sister, born in Zürich but currently living partially in Switzerland, partially in Los Angeles.Corinne ‘Co’ Gfeller (born June 6, 1985)