Du gamla, du fria

"Du gamla, du fria" ( ; "Thou ancient, thou free"), originally titled "Sång till Norden" ("Song to the North"), is the Swedish title and incipit of a 19th-century patriotic song which serves as the "de facto" national anthem of Sweden – it is therefore unofficial. The lyrics (words) were written by Swedish jurist and antiquarian Richard Dybeck in 1844, and its melody is based on a traditional folk tune which was later rearranged by Swedish composer and librarian Edvin Kallstenius nearly a century later.
Unlike Norway's national anthem, "Ja, vi elsker dette landet", the Swedish anthem has not been made official yet—the Swedish constitution has yet to mention a national anthem.