A curly headed man is playing an instrument, and a lady in a mauve dress.
Curly headed man serenades his girlfriend on the street.
Not all ladies are a girlfriend.  Playing an instrument does not imply he serenades on the street.
exists e1 e2 x1 x2 x3 x4 x5 x6 x7 x8.(in(e2,x7) & n_dress(x7) & of(x7,x8) & n_mauve(x8) & Theme(e2,x4) & Actor(e2,x1) & v_play(e2) & subset_of(x6,x4) & n_lady(x6) & subset_of(x5,x4) & n_instrument(x5) & Time(e1,x3) & n_man(x3) & Theme(e1,x2) & v_head(e1) & (x1 = x2) & n_curly(x1))
exists e1 e2 s1 x1 x2 x3 x4.(n_street(x4) & while(e2,e1) & Theme(e2,x3) & Actor(e2,x2) & v_serenade(e2) & on(x3,x4) & n_girlfriend(x3) & of(x3,x1) & n_male(x1) & n_man(x2) & a_curly(s1) & Manner(e1,s1) & Theme(e1,x1) & v_head(e1) & n_thing(x1))