Three guys, one playing the guitar, one playing the keyboard accordion and one playing the violin.
The three guys are in a band together and are playing a concert.
Three guys in a band together are not necessarily playing a concert.
exists e3 e1 e2 x1 x2 x3 x4 x5 x6 x7 x8.(n_violin(x8) & n_accordion(x5) & of(x5,x6) & n_keyboard(x6) & n_guitar(x3) & Theme(e3,x8) & Actor(e3,x7) & v_play(e3) & n_thing(x7) & card_eq_1(x7) & Theme(e2,x5) & Actor(e2,x4) & v_play(e2) & n_thing(x4) & card_eq_1(x4) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & rel(x1,x2) & n_thing(x2) & card_eq_1(x2) & n_guy(x1) & card_eq_3(x1))
exists e1 p1 s1 x1 x2.(n_guy(x1) & card_eq_3(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_concert(x2) & a_together(s1) & Manner(p1,s1) & exists x3.(in(x1,x3) & n_band(x3)))