In the Ukrainian village of Kivshovata, south of Kyiv, air raid sirens have become part of everyday life. Although far from the front line, Kivshovata lies on the flight path for Russian drones and missiles. It is also home to a unique youth orchestra that has become famous in Ukraine for its piece the "Shahed Overture", which reproduces the sounds of a night of war. Our correspondent Gulliver Cragg reports.