A group of people playing bagpipes.
A group of people are performing for money.
A group of people can be  playing bagpipes without performing for money.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_bagpipe(x4) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2 x3.(for(e1,x3) & n_money(x3) & Actor(e1,x1) & v_perform(e1) & of(x1,x2) & n_people(x2) & n_group(x1))