A crowd watches an outdoor concert.
The musicians are performing for a crowd.
The concert may not have musicians.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_concert(x2) & a_outdoor(s1) & Theme(s1,x2) & n_crowd(x1))
exists e1 x1 x2.(n_musician(x1) & for(e1,x2) & n_crowd(x2) & Actor(e1,x1) & v_perform(e1))