One man plays an acoustic guitar, while another accompanies him on the accordion.
Two men play their musical instruments.
An acoustic guitar and accordion are musical instruments
exists e1 p1 s1 x1 x2 x4.(n_accordion(x4) & exists e2 x3.(on(e2,x4) & Theme(e2,x2) & Actor(e2,x3) & v_accompany(e2) & n_thing(x3)) & n_male(x2) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_guitar(x2) & a_acoustic(s1) & Theme(s1,x2) & n_man(x1) & card_eq_1(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_instrument(x2) & a_musical(s1) & Theme(s1,x2) & of(x2,x1) & n_thing(x1) & n_man(x1) & card_eq_2(x1))