Related Clues:
- "Fernando" foursome
- ''Mamma Mia!'' band
- 'Voulez-Vous' band
- "Voulez-Vous" band
- 2010 Rock Hall inductee
- ''Mamma Mia!'' singing group
- Bespangled Swedish quartet
- Fifteenth best-selling artists of all time
- "Dancing Queen" singers
- Eurovision 1974 got them started
- "SOS" singers
- ''Waterloo'' pop group
- Scheme for a quatrain
- Group whose last Top 40 hit was 'When All Is Said and Done'
- Renowned Swedish foursome