Icelandic music is related to Nordic music, and includes vibrant folk and pop traditions, medieval music group Voces Thules, alternative and indie rock bands The Sugarcubes and Of Monsters and Men, jazz fusion band Mezzoforte, musicians Björk and Emilíana Torrini, and post-rock band Sigur Rós. The national anthem of Iceland is Lofsöngur, written by Matthías Jochumsson, with music by Sveinbjörn Sveinbjörnsson.