A rock band with a female vocalist performs in the street with a white van in the background.
There are drums.
A rock band, particularly a street band, doesn't always include drums.
exists s1 s2 x1 x2 x3 x4 x5 x6 x7.(n_background(x7) & n_street(x5) & a_topic(x1) & with(x1,x3) & with(x3,x6) & in(x6,x7) & n_van(x6) & a_white(s2) & Theme(s2,x6) & in(x3,x5) & n_perform(x3) & of(x3,x4) & n_vocalist(x4) & a_female(s1) & Theme(s1,x3) & n_band(x1) & of(x1,x2) & n_rock(x2))
exists p1 x1 x2.((x1 = x2) & n_drum(x2))