A man is playing a guitar solo
A man is performing for his girlfriend.
Playing a guitar solo does not mean the performance is for a girlfriend.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_solo(x2) & of(x2,x3) & n_guitar(x3) & n_man(x1))
exists e1 x1 x2.(for(e1,x2) & n_girlfriend(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_perform(e1) & n_man(x1))