A band playing s song in front of a crowd.
A band is backstage waiting to play.
Waiting and playing are two different things.
exists e1 x1 x2 x3 x4 x5.(in(e1,x4) & of(x4,x5) & n_crowd(x5) & n_front(x4) & Theme(e1,x3) & Actor(e1,x1) & v_s(e1) & n_song(x3) & n_playing(x1) & of(x1,x2) & n_band(x2))
exists e1 p1 s1 x1.(a_backstage(s1) & Manner(e1,s1) & Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2.(Actor(e2,x1) & v_play(e2)) & n_band(x1))