Question: The Norwegian folk rock band from Lom in Gudbrandsdalen established in 1982 based their concept album "Bukkerittet" on what five-act play in verse by the Norwegian dramatist Henrik Ibsen published in 1867?
Sentence (from "Peer Gynt"): Written in Danish—the common written language of Denmark and Norway in Ibsen's lifetime—it is one of the most widely performed Norwegian plays.
Relevant evidence: No