Bert Boldon plays the steel drums, the piano and the congas. He is a teacher of history and sociology, a member of the McGill Conserva tory Jazz Band, founder of the Trinidad Sound Explosion. And, he has taught at the Berklee College of Music as well as accompanied any number of famous musicians throughout his 20-years career. Calypso Latin Jazz Ensemble will present calypso rythms to the audiences of the Fourth Montréal Festival.