A large group of people look as if they are in a band, and they are practicing classical music with guitars, violins, and cellos.
Many people are playing stringed instruments.
Group of people is many people and practicing classical music with guitars, violins, and cellos is same as plying stringed instruments
exists e2 e1 p1 s1 s2 x1 x2 x3 x4 x5 x6 x7.(Theme(e2,x4) & Actor(e2,x3) & v_practice(e2) & subset_of(x7,x4) & n_cello(x7) & subset_of(x3,x4) & with(x3,x5) & rel(x5,x6) & n_violin(x6) & n_guitar(x5) & n_music(x3) & a_classical(s2) & Theme(s2,x3) & n_thing(x3) & n_thing(x3) & exists p2 x8.(in(x3,x8) & n_band(x8)) & as(e1,p1) & Actor(e1,x1) & v_look(e1) & of(x1,x2) & n_people(x2) & n_group(x1) & a_large(s1) & Theme(s1,x1))
exists e1 e2 x1 x2.(Theme(e2,x2) & Actor(e2,x1) & v_play(e2) & n_instrument(x2) & Theme(e1,x2) & v_stringe(e1) & n_people(x1) & n_quantity(x1))