A man playing his guitar by a hotel pool.
The man is playing rock music on his guitar.
Not all music played on a guitar is rock music.  The man might be playing classical guitar music.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & by(e1,x4) & n_pool(x4) & of(x4,x5) & n_hotel(x5) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_guitar(x3) & of(x3,x1) & n_male(x1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3 x4.(n_guitar(x4) & of(x4,x1) & n_male(x1) & n_man(x1) & on(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2) & of(x2,x3) & n_rock(x3))