A conductor leading a band in music.
The conductor is signaling an airplane landing.
A conductor leads a band, not an airplane.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_music(x4) & Theme(e1,x3) & Actor(e1,x2) & v_lead(e1) & n_band(x3) & (x1 = x2) & n_conductor(x1))
exists e1 x1 x2 x3.(n_conductor(x1) & Theme(e1,x2) & Actor(e1,x1) & v_signal(e1) & n_landing(x2) & of(x2,x3) & n_airplane(x3))