A blue-haired girl plays guitar on the sidewalk.
A girl is playing her guitar for the people.
A guitar can be played on the sidewalk for many reasons and not necessarily for the people.
exists e1 s1 x1 x2 x3.(n_sidewalk(x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & n_girl(x1) & a_blue-haired(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_people(x3) & for(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & of(x2,x1) & n_female(x1) & n_girl(x1))