Sparks rock band/glam rock era of the 70's, the synth pop of the 80's and 90's and the pop minimalism of the 00's. FFS essentially united all the eras together and marks the encapsulation/synthesis era of the band.
Sparks basically abandoned rock music for three dacades and by uniting with a rock group and having a rock backing group. It allowed Sparks to finally come back and reclaim their past without forgetting their development throughout the career.
However as Franz Ferdinand were a rock group that was keen to have electronica and dance elements this allowed the 80's to 00's era of Sparks to be incorporated.
All future Sparks era album Hippopotamus, A steady Drip and Annette onward followed the footsteps of FFS in uniting their career together. The rock and roll band returns but the electronica and the pop minimalism remains.