Three musical performers do their act.
Instruments are being played.
Musical performers use instruments.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_act(x2) & of(x2,x1) & n_thing(x1) & n_performer(x1) & a_musical(s1) & Theme(s1,x1) & card_eq_3(x1))
exists e1 x1.(ne_nam_instruments(x1) & Theme(e1,x1) & v_play(e1))