 Complete the following phrase:  They were guest performers at Congratulations, a special 50th anniversary concert for the Eurovision Song Contest held in Copenhagen, Denmark in October, 2005, at which they performed Waterloo. Co-host Renars Kaupers suggested jokingly that perhaps Finlands notoriously poor performances at Eurovision in future could be remedied by the choir performing their own songs. This suggestion was somewhat ironic, as Finland won the 