Orchestra is playing in the background while we see the back of a cameraman in the foreground holding a video camera on his shoulder.
The man is filming the swans performing in the orchestra.
You wouldn't be able to see the back of the cameraman if he were filming you.
exists e1 p1 x1 x2 x3 x5 x8.(n_shoulder(x8) & of(x8,x2) & n_male(x2) & n_foreground(x5) & n_back(x3) & n_person(x1) & n_background(x2) & ne_geo_orchestra(x1) & exists e2 p2 x4.(exists e3 x6 x7.(on(e3,x8) & Theme(e3,x6) & Actor(e3,x3) & v_hold(e3) & n_camera(x6) & of(x6,x7) & n_video(x7)) & Recipient(e2,p2) & Actor(e2,x1) & Topic(e2,x3) & v_see(e2) & of(x3,x4) & in(x4,x5) & n_cameraman(x4)) & while(e1,p1) & in(e1,x2) & Actor(e1,x1) & v_play(e1))
exists e2 e1 x1 x2 x3 x4.(n_orchestra(x4) & n_swan(x2) & n_man(x1) & Theme(e2,x2) & Actor(e2,x1) & v_film(e2) & in(e1,x4) & Actor(e1,x3) & v_perform(e1) & (x2 = x3))