A man playing a guitar on stage under red light.
The man is playing a bagpipe.
One can be playing either guitar or bagpipe.
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(x1) & under(e1,x5) & n_light(x5) & a_red(s1) & Theme(s1,x5) & on(e1,x4) & n_stage(x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_guitar(x3) & (x1 = x2) & n_man(x1))
exists e1 x1 x2.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_bagpipe(x2))