Two men sitting on a couch, playing music together.
Two men are playing the violin.
It is possible for people to play music on something other than a violin.
exists e1 e2 s1 x1 x2 x3 x4.(a_together(s1) & Manner(e2,s1) & Theme(e2,x4) & Actor(e2,x1) & v_play(e2) & n_music(x4) & on(e1,x3) & n_couch(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
exists e1 x1 x2.(n_violin(x2) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_man(x1) & card_eq_2(x1))