A large group of people look as if they are in a band, and they are practicing classical music with guitars, violins, and cellos.
A classical ensamble is playing.
Not everyone who is playing in a band with stringed instruments is a classical ensamble.
exists e1 e2 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 s1 x1.(Actor(e1,x1) & v_play(e1) & n_ensamble(x1) & a_classical(s1) & Theme(s1,x1))