public CameraCrew()
 {
     mainCamera = Camera.main;
     mainLight = GameObject.Find ("Directional Light").GetComponent<Light> ();
     mainMusic = GameObject.FindGameObjectWithTag ("Music").GetComponent<DribbleTestMusicManager> ();
 }
 // instance constructors
 public CameraCrew(Camera cam, Light light, DribbleTestMusicManager music)
 {
     mainCamera = cam;
     mainLight = light;
     mainMusic = music;
 }