A rock concert is taking place.
A classical musician plays for a small audience.
There can be either a rock concert taking a place or classical musician playing.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_take(e1) & n_place(x3) & n_concert(x1) & of(x1,x2) & n_rock(x2))
exists e1 s1 s2 x1 x2.(for(e1,x2) & n_audience(x2) & a_small(s2) & Theme(s2,x2) & Actor(e1,x1) & v_play(e1) & n_musician(x1) & a_classical(s1) & Theme(s1,x1))