The saxophone player is performing on the street corner.
A pianist is playing in a concert hall.
A pianist plays a piano not a saxophone. If you are in a concert hall you cannot be on a street corner as well.
exists e1 x1 x2 x3 x4.(n_corner(x3) & of(x3,x4) & n_street(x4) & n_player(x1) & of(x1,x2) & n_saxophone(x2) & on(e1,x3) & Actor(e1,x1) & v_perform(e1))
exists e1 x1 x2 x3.(in(e1,x2) & n_hall(x2) & of(x2,x3) & n_concert(x3) & Actor(e1,x1) & v_play(e1) & n_pianist(x1))