A group of people practicing performing music.
People practicing.
A group of people is made up of people while practicing applies to practicing performing music.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_perform(e1) & n_music(x4) & (x2 = x3) & n_people(x2) & n_group(x1))
exists e1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_practice(e1) & (x1 = x2) & n_people(x1))