Three guys on stage, one of whom has a guitar and another a keyboard.
Three men on a stage are setting up musical instruments.
Just because they are on a stage with a guitar and keyboard doesn't mean they are setting up musical instruments.
exists e1 x1 x2 x3 x4 x5 x6 x7 x8.(Theme(e1,x5) & Actor(e1,x4) & v_have(e1) & subset_of(x7,x5) & Time(x7,x8) & n_another(x8) & n_keyboard(x7) & subset_of(x6,x5) & n_guitar(x6) & of(x4,x3) & n_one(x4) & a_topic(x1) & (x1 = x3) & on(x1,x2) & n_stage(x2) & n_guy(x1) & card_eq_3(x1))
exists e1 s1 s2 x1 x2 x3.(a_up(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x1) & v_set(e1) & n_instrument(x3) & a_musical(s1) & Theme(s1,x3) & on(x1,x2) & n_stage(x2) & n_man(x1) & card_eq_3(x1))