 The violins are further divided into parts of different levels of difficulty, from the simplest (mostly playing open strings) to those able to play in third position.The recorders should be led by an accomplished soloist able to flutter-tongue; bugles, played in the original production by boys from a local school band, are played as the children representing animals march into the ark, and at the climax of the opera.The child percussionists, led by a professional timpanist, play various exotic and invented percussion instruments