A musician playing a keyboard in a concert.
The musician is playing a song he wrote himself
Just because he is playing a song, doesn't mean he wrote it.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_concert(x4) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_keyboard(x3) & (x1 = x2) & n_musician(x1))
exists e1 p1 x1 x2.(n_male(x1) & n_musician(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_write(e2)) & n_male(x2) & that(x2,p1) & n_song(x2))