A band is playing music on stage in the city.
a woman stands on stage by herself
A woman by herself is not a band as a band is more than one person.
exists e1 x1 x2 x3 x4.(n_city(x4) & in(e1,x4) & on(e1,x3) & n_stage(x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2) & n_band(x1))
exists e1 x1 x2.(by(e1,x1) & n_female(x1) & on(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_stand(e1) & n_woman(x1))