Musicians doing with they do best.
All of the musicians are dressed in black.
We have no idea if they are dressed in black, they could be dressed in any color.
exists e2 e1 s1 x1 x2.(n_thing(x1) & ne_nam_musicians(x1) & a_best(s1) & Manner(e2,s1) & Actor(e2,x1) & v_do(e2) & with(e1,x1) & Actor(e1,x2) & v_do(e1) & (x1 = x2))
exists x2.(n_musician(x2) & all x1.(n_thing(x1) -> exists e1 s1 x3.(Theme(e1,s1) & Theme(s1,x3) & a_black(s1) & Theme(e1,x1) & v_dress(e1) & of(x1,x2))))