A man is performing some music.
There is a musician performing.
A man perform some music in musician performing
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_music(x2) & n_man(x1))
exists p1 x1 e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_perform(e1) & (x2 = x3) & n_musician(x2))