Guy blacking a guitar on stage.
guy about to perform
A guy on stage is not necessarily about to perform.
exists e1 x1 x2 x3.(ne_nam_guy(x1) & on(e1,x3) & n_stage(x3) & Theme(e1,x2) & Actor(e1,x1) & v_black(e1) & n_guitar(x2))
exists p1 s1 x1 x2.(a_topic(x1) & Topic(s1,p1) & Actor(s1,x2) & a_about(s1) & exists e1.(Actor(e1,x2) & v_perform(e1)) & (x1 = x2) & n_guy(x1))