Possible Clues:

• Band that recorded ''Unbelievable''
• They had an Unbelievable first hit
• Techno-funk band with the 1991 #1 hit 'Unbelievable'
• Mail 1,000 francs into monetary fund
• Their debut album was titled Schubert Dip
• British band with 'Unbelievable'
• Potential difference: Abbr.
• One-hit wonder with 'Unbelievable'
• Generator output: Abbr.
• 1990s "Unbelievable" band