A band plays an outdoor concert.
people were playing music
band plays an outdoor concert implies that playing music
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_concert(x2) & a_outdoor(s1) & Theme(s1,x2) & n_band(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2) & n_people(x1))