Many of the sagas apparently date to this period, and possibly even prior to settlement, but were written down only from around the 13th century. This poetry and its recitation are inherently oral traditions. There is no musical notation which accompanies it, and so Sequentia's reconstructions are particularly hypothetical. The amount of effort put into this production is very impressive, based as it was over the course of years of study. There is an alternation of more lyrical passages with some more dramatic recitations, as one might generally say this material was typically performed in the bardic tradition.
Medieval pronunciation is attempted as well.
Sequentia's intention is to continue in this direction with other Northern European music, principally the Beowulf saga.