Question: What type of collection does Nådens år and Agnetha Fältskog have in common?

Context articles: Tio år med Agnetha
Swedish name
Agnetha Fältskog De Första Åren
Agnetha Fältskog
Nådens år
Om tårar vore guld
Agnetha Fältskog (album)
Agnetha Fältskogs bästa
Agnetha Fältskog Vol. 2
Geh' Mit Gott

Tio år med Agnetha (Ten Years With Agnetha) is a 1979 compilation album by Swedish pop singer Agnetha Fältskog, one of the members of ABBA.
 The album, released when ABBA's international career was at its peak, features the most successful Swedish solo recordings Fältskog made before and during her career with the band and it was her last album on the CBS-Cupol label.
In Sweden, a person must have a surname and one or more given names. Two given names are common.
 Surnames are inherited from the parents, in the order of "same as elder sibling, if any; specified by parents; or mother's last name," while given names must be chosen by the parents at birth.
 The calling name (Swedish "tilltalsnamn", French "Prénom usuel") by which the person is normally identified in conversation, is in Scandinavian countries (and previously in France) one of the given names, not necessarily the first.
 In contexts where the full name is spelled out, the calling name is often indicated by an asterisk, by capital letters, or underlines or italics.
 For example, Märta Birgit* Nilsson is known as Birgit Nilsson, while Agnetha* Åse Fältskog is known as Agnetha Fältskog.
'Agnetha Fältskog De Första Åren 1967–1979' (Agnetha Fältskog the early years) is a box set by Swedish pop singer and ABBA member Agnetha Fältskog, released in 2004 .
Agnetha Fältskog (] , born 5 April 1950) is a Swedish musician, singer, songwriter, actress, and author.
 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.
Nådens år (The Year of Grace) is the third studio album by the Swedish rock artist Ulf Lundell.
 It was released in April 1978 on EMI and Parlophone.
 It was recorded in EMI Studio, Stockholm, and produced by Kjell Andersson and Lundell.
 It includes "Snön faller och vi med den" ("The snow is falling and we are too"), one of Lundell's more famous songs.
 Agnetha Fältskog is involved in the song.
 The cover picture shows Lundell sitting on a rock next to a dog and was taken in Åre in 1977.
 "Nådens år" achieved Gold status in Sweden.
Om tårar vore guld is a song written by Agnetha Fältskog and recorded by Fältskog.
 Fältskog's rendition was released as a single in March 1970, and also appeared on her album "Som jag är" the same year.
 The song charted at Svensktoppen for weeks between 12 April and 19 July 1970, peaking at third position.
Agnetha Fältskog is the eponymous debut studio album by Swedish pop singer and future ABBA member Agnetha Fältskog.
 It was released in Sweden in early 1968 through Cupol Records.
Agnetha Fältskogs Bästa (Agnetha Fältskog's Best) is a compilation album by the Swedish pop singer and ABBA member Agnetha Fältskog.
 It was released in 1973 through CBS Cupol.
Agnetha Fältskog Vol.
 2 is the second solo album by the Swedish pop singer and ABBA member Agnetha Fältskog.
 It was recorded and released in 1969 through Cupol Records.
Geh' mit Gott is a compilation album in German by Swedish singer Agnetha Fältskog, released in 1994 by Royal Records.
 The album contains Fältskog's German singles recorded for Metronome and CBS between 1968 and 1972.
 It was quickly deleted and is now a collector's item amongst ABBA fans.
 Presumably, the original master tapes for the German recordings are lost, as the sound on this CD has been allegedly transferred from the original singles.
 The compilation's first release of the German singles was "Agnetha in Germany" by Odoriko Music, in 1989.