Swedish group. Most of the songs were written by Benny Andersson and Björn Ulvaeus, and sometimes Stig Anderson.
There have been 7 known masters of the original studio recordings:
- Original releases (1974-1981)
- CD releases (1982-1992)
- ABBA Gold and Thank You For the Music Box Set (1992-1994), remastered by Michael B. Tretow
- Remastered releases (1997), remastered by Jon Astley and Tim Young.
- Remastered releases (2001), when Jon Astley revisited his earlier remasters, and fixed some errors.
- Remastered releases (2005), made by Henrik Jonsson. Featured on "The Complete Studio Recordings" and "The Albums" box sets.
- Remastered releases (2005-), feature on the Deluxe albums. Some of these albums use the same remasters as the previous two box sets, some are completely new remasters (Voulez-Vous, Super Trouper, The Visitors, ABBA).