A female singer and male guitarist on stage.
People on stage
A female and male would be considered people.
exists s1 s2 x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_stage(x3) & n_guitarist(x1) & a_male(s2) & Theme(s2,x1) & of(x1,x2) & n_singer(x2) & a_female(s1) & Theme(s1,x1))
exists x1 x2.(a_topic(x1) & on(x1,x2) & n_stage(x2) & n_people(x1))