Artists appearing to pay tribute include Eddi Reader, Dougie MacLean, Pat and Greg Kane, Kris Drever and Aberfeldy's Riley Briggs.

BBC: Michael Marra

Some kidnap groups may have political beliefs, but the Foreign Policy Centre's Rachel Briggs said the driving force for all of them - like any multinational company - is trade, reputation and the bottom line.

BBC: The kidnapping business

The champion's most recent win was over Poland's Albert Sosnowski in May 2010, while New Yorker Briggs's most recent bout was a victory over Rob Calloway in May.

BBC: Vitali Klitschko (left) and Shannon Briggs