Question: What type of collection does Nådens år and Agnetha Fältskog have in common?
Sentence (from "Agnetha Fältskog"): She achieved success in Sweden after the release of her debut album "Agnetha Fältskog" in 1968, and reached international stardom as a member of the pop group ABBA, which has sold over 380 million albums and singles worldwide, making them one of the best-selling music artists in history.
Relevant evidence: Yes