A black-haired man plays a guitar.
The man is playing rock and roll.
A black-haired man plays a guitar does not indicate that he is playing rock and roll.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & n_man(x1) & a_black-haired(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_roll(x4) & n_rock(x3) & subset_of(x4,x2) & subset_of(x3,x2))