A picture of some women singing at mikes.
A group of males singing at a bar.
The first sentence refers to women, not men, singing at mikes, not at a bar.
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & at(e1,x4) & n_mike(x4) & Actor(e1,x3) & v_sing(e1) & (x2 = x3) & n_woman(x2) & n_picture(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & of(x1,x2) & at(e1,x4) & n_bar(x4) & Actor(e1,x3) & v_sing(e1) & (x2 = x3) & n_male(x2) & n_group(x1))