Two men performing a song, one singing, the other playing an instrument.
two men are performing
Two men performing are doing just that.
exists e1 e2 x1 x2 x3 x4 x5.(n_other(x4) & Theme(e2,x5) & Actor(e2,x4) & v_play(e2) & n_instrument(x5) & rel(e1,x3) & n_singing(x3) & card_eq_1(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_song(x2) & n_man(x1) & card_eq_2(x1))
exists e1 x1.(Actor(e1,x1) & v_perform(e1) & n_man(x1) & card_eq_2(x1))