Jo Almaas Marstein, born on October 25, 2002 in Oslo, Norway, is a rapper known
professionally as Marstein. He grew up in the Gamle Oslo district and played for
youth teams of the football club Vålerenga Oslo during his adolescence. In 2017,
Marstein co-founded the rap group Undergrunn with Patrick Bakkeng, Gabriel
Doria, Marcos Haugestad, Sverre Skogheim Gudmestad, and Jon Ranes. The group
released their debut EP UG Sommer in autumn 2018.
Marstein's solo career began with the release of his first album, Medici
Marstein, on September 23, 2022. This was followed by an EP, Xania, o...