Music festivals are odd beasts. No two are alike. They have thousands of moving parts; all contributing to the whole. It's an intriguing and complicated system. On Heart Of A Festival, we try to get to the bottom of what makes the Celtic Colours International Festival so special. Why does this festival attract the biggest celtic acts in the world? And what goes into putting this festival together? You'll probably find out some secrets and get a peek behind the scenes to meet the people that make it all work.