A band plays a concert for fans.
a band plays music
Concert typically has music.
exists e1 x1 x2 x3.(for(e1,x3) & n_fan(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_concert(x2) & n_band(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2) & n_band(x1))