Related Clues:
- ''Knowing Me, Knowing You'' group
- Rhyme scheme of Rubáiyát stanzas
- "Voulez-Vous" group
- Alphabetically first pop group with a #1 hit
- '70s mega-selling pop group
- ''SOS'' singers
- Band from Stockholm
- "Mamma Mia" inspiration
- Their songs are in ''Mamma Mia!''
- Pop group spelled with a backward letter
- ''S.O.S.'' group
- Acronymic singing group
- "Super Trouper" band
- 'Dancing Queen' singers
- 'I Do, I Do, I Do, I Do, I Do' group