A band is practicing their routine.
Musicians practice their instruments.
A band plays instruments
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_practice(e1) & n_routine(x2) & of(x2,x1) & n_thing(x1) & n_band(x1))
exists s1 x1 x2 x3.(a_topic(x1) & n_instrument(x1) & a_their(s1) & Theme(s1,x1) & of(x1,x3) & n_practice(x3) & (x1 = x2) & ne_nam_musicians(x2))