One man sings while another plays guitar during a stage show.
Two men are on stage giving a performance.
To be on stage means to be giving a performance.
(x)
exists e1 p1 x1 x2.(for(p1,e1) & Theme(e1,x2) & Actor(e1,x1) & v_give(e1) & n_performance(x2) & exists x3.(on(x1,x3) & n_stage(x3)) & n_man(x1) & card_eq_2(x1))