Systur is an Icelandic folk trio consisting of the three sisters Sigríður, Elísabet and Elín Eyþórsdóttir, shortly Sigga, Beta and Elin. They come from a musical family. Their parents, singer Ellen Kristjánsdóttir and mezzoforte keyboardist Eyþór Gunnarsson — as well as her uncle Kristján Kristjánsson — are well-known musicians in Iceland. The three performed solo, but they also made a name for themselves as Sísý Ey — a band they formed in 2011 with DJ Oculus. In 2013 the band released their first single “Ain’t Got Nobody”, which reached number 1 spot in the Icelandic charts. They performed at the Glastonbury Festival in 2016.
In 2017, the siters released their first single as a trio, entitled “Bounce from the Bottom”. They performed under the name of Tripolia.
Under the names of Sigga, Beta and Elin, they won Söngvakeppnin, the Icelandic national final for the Eurovision Song Contest, in 2022. For the Eurovision Song Contest, they changed their names into Systur. The song they sang was in Icelandic. Systur were, during the international final in Turin, accompanied on drums by their brother Eyþór Ingi Eyþórsson.
Outside of music, they are trans rights activists, particularly for transgender children. One of the sisters is the mother of a transgender son.