Interviews from band members, producers and others comparing two iconic bands - ABBA and Queen.
Björn Ulvaeus
Benny Andersson
Agnetha Fältskog
Anni-Frid Lyngstad
Freddie Mercury
Roger Taylor
Brian May
John Deacon
Katy Perry
Sophie Ellis-Bextor
Bono
Arlene Phillips
Lulu
Paul Gambaccini
Taylor Hawkins
Robin Gibb
Bob Geldof
Dave Grohl