Question: What sources, both before and after the pagan period, is the mythology derived from  that is also the mythology featured in Mats Wendt's 16 hour-long cybersyomphic work "Eddan - the invincible sword of the elf-smith"?
Sentence (from "Mats Wendt"): Mats Wendt (born in 1965) is a Swedish classical composer and artist.
Relevant evidence: Yes