Mu isamaa, mu õnn ja rõõm” (‘My Fatherland, My Happiness and Joy’; [mu ˈisɑ.mɑː, mu ˈɤnʲˈ jɑ ˈrɤːm]) is the national anthem of Estonia. It was adopted as the national anthem in 1920. The lyrics were written by Johann Voldemar Jannsen and are set to a melody composed in 1848 by Fredrik (Friedrich) Pacius which is also that of the national anthem of Finland: “Maamme” (Swedish: “Vårt Land”, which was the unofficial anthem of The Grand Duchy of Finland ). The only difference between the two anthems is the key signature they are in.