A band of musicians performing for a rally.
A band is rehearsing in an empty rehearsal hall.
Performing is different from rehearsing. Many people are at a rally, and rallies are not held in rehearsal halls.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & for(e1,x4) & n_rally(x4) & Actor(e1,x3) & v_perform(e1) & (x2 = x3) & n_musician(x2) & n_band(x1))
exists e1 s1 x1 x2 x3.(in(e1,x2) & n_hall(x2) & of(x2,x3) & n_rehearsal(x3) & a_empty(s1) & Theme(s1,x2) & Actor(e1,x1) & v_rehearse(e1) & n_band(x1))