Musicians perform outdoors.
People are outdoors.
Musicians are people, and both are outdoors.
exists e1 x1 x2.(ne_nam_musicians(x1) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_outdoors(x2))
exists p1 x1.(exists x2.((x1 = x2) & n_outdoors(x2)) & n_people(x1))