a guitarist with a black shirt on stage playing guitar and singing
The bands lead singer and guitarist sings on stage.
We know the guitarist sings and plays the guitar but we don't know if he or she is part of a band and if so if he or she is the lead singer.
exists e1 s1 x1 x2 x3 x4 x5 x6 x7.(a_topic(x1) & with(x1,x2) & on(x2,x3) & Theme(e1,x5) & Actor(e1,x4) & v_play(e1) & n_singing(x7) & n_guitar(x6) & subset_of(x7,x5) & subset_of(x6,x5) & (x3 = x4) & n_stage(x3) & n_shirt(x2) & a_black(s1) & Theme(s1,x2) & n_guitarist(x1))
exists e1 x1 x2 x3 x4 x5.(n_band(x1) & on(e1,x5) & n_stage(x5) & Theme(e1,x2) & Actor(e1,x1) & v_lead(e1) & n_sing(x2) & of(x2,x4) & n_guitarist(x4) & of(x2,x3) & n_singer(x3))