Visitors to this concert might well have thought something fishy was going on when they saw the musicians put on their wet suits and take their instruments into the ocean. However, this was no ordinary gig. More than 500 divers and snorkelers descended on the Florida Keys National Marine Sanctuary for the 27th Underwater Music Festival. Donning marine-themed fancy dress and adopting stage names such as Eel-vis Presley, Bob Marlin and Joss Stone Crab, the would-be musicians submerged themselves under water to perform in the symphony under the sea. Armed with fishy instruments such as 'clambourines, guitars in the shape of a starfish and a bass masquerading as a ray, they belted out tunes, creating good vibrations for the surrounding marine life. The wacky event is staged to celebrate the colourful diversity of marine life that characterises north Americas only living coral barrier reef - and also promotes preservation. Bill Becker, festival director, told CBS: 'We have a lot of fun, we dress up in costumes, but theres a serious side. Coral reef conservation is the message. Snorkeller and first-time festival-goer Gail Coad added: 'The fish seemed to enjoy the music as much as I did. They almost were dancing in unison to the melody, and the music just kind of surrounds you. MO