Once again, Mr Salmond refused to follow her lead - preferring instead to stress his preference for a sterling zone.

BBC: The currency of debate at First Minister's Questions

The move puts pressure on other artists to follow her lead, while simultaneously insinuating that the list of performers may be more extensive than originally thought.

FORBES: Nelly Furtado To Donate $1 Million From Gadhafi Family Concert

They follow her lead.

CNN: Opinion: Author's rant on Catherine 'mean and cheap'