A group of young people playing music outside.
A rock band is playing in the park.
Playing music outside does not always occur in the park and a group of young people does not have to be a rock band.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & a_outside(s2) & Manner(e1,s2) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_music(x4) & (x2 = x3) & n_people(x2) & a_young(s1) & Theme(s1,x2) & n_group(x1))
exists e1 x1 x2 x3.(n_park(x3) & in(e1,x3) & Actor(e1,x1) & v_play(e1) & n_band(x1) & of(x1,x2) & n_rock(x2))