A band plays an outdoor concert.
the audience sang along
Audience sang doesn't means that they are in concert
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 s1 x1.(n_audience(x1) & a_along(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sing(e1))