A orchestra performing a piece.
The group are playing music.
Orchestra is a group and performing a piece implies playing music
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_piece(x3) & (x1 = x2) & n_orchestra(x1))
exists e1 x1 x2.(n_group(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_music(x2))