An orchestra is assembled and waiting to begin playing.
an orchestra is waiting to play
Assembled and waiting implies waiting. To begin playing implies to play.
exists e2 e1 p1 s1 x1 x2 x3.(a_topic(s1) & subset_of(e2,s1) & Topic(e2,p1) & Actor(e2,x3) & v_wait(e2) & exists e3 p2.(exists e4.(Actor(e4,x3) & v_play(e4)) & Topic(e3,p2) & Actor(e3,x3) & v_begin(e3)) & n_thing(x3) & subset_of(x1,s1) & Theme(e1,x2) & v_assemble(e1) & (x1 = x2) & n_orchestra(x1))
exists e1 p1 x1.(Topic(e1,p1) & Actor(e1,x1) & v_wait(e1) & exists e2.(Actor(e2,x1) & v_play(e2)) & n_orchestra(x1))