One man wearing a black shirt and pants is kneeling on a stage in front of a microphone while another man in a black shirt plays the drums.
Two bandmembers are practicing before a concert.
Just because two men are on a stage doesn't mean they are band members practicing before a concert.
exists e1 e2 p1 s1 x1 x2 x3 x4 x5 x6 x7 x8 x11.(n_drum(x11) & exists e3 s2 x9 x10.(Theme(e3,x11) & Actor(e3,x9) & v_play(e3) & in(x9,x10) & n_shirt(x10) & a_black(s2) & Theme(s2,x10) & n_man(x9) & -(x9 = x1)) & n_man(x1) & n_man(x1) & while(e2,p1) & in(e2,x7) & of(x7,x8) & n_microphone(x8) & n_front(x7) & on(e2,x6) & n_stage(x6) & Actor(e2,x1) & v_kneel(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & subset_of(x5,x3) & n_pants(x5) & subset_of(x4,x3) & n_shirt(x4) & a_black(s1) & Theme(s1,x4) & (x1 = x2) & card_eq_1(x1))
exists e1 x1 x2.(before(e1,x2) & n_concert(x2) & Actor(e1,x1) & v_practice(e1) & n_bandmember(x1) & card_eq_2(x1))