premise: In front is a guy singing and playing guitar and a white shirted drummer in the back.
hypothesis: Some people perform at a concert.
explanation_1: You can not infer they perform.
explanation_2: People singing and playing guitar are not necessarily playing at a concert.
explanation_3: People can play instruments and not be performing a concert.
premise_logic: exists p1 s1 x1 x2 x8 x13.(n_back(x13) & n_back(x8) & r_.(s1) & in(s1,x1) & exists e2 e1 s2 s3 s4 s5 x3 x4 x5 x6 x7 x9 x10 x11 x12.((x2 = x3) & Theme(e2,x10) & Actor(e2,x9) & v_play(e2) & subset_of(x12,x10) & in(x12,x13) & n_drummer(x12) & a_shirted(s5) & Theme(s5,x12) & a_white(s4) & Theme(s4,x12) & subset_of(x11,x10) & n_guitar(x11) & (x3 = x9) & Theme(e1,x5) & Actor(e1,x4) & v_sing(e1) & subset_of(x7,x5) & in(x7,x8) & n_drummer(x7) & a_shirted(s3) & Theme(s3,x7) & a_white(s2) & Theme(s2,x7) & subset_of(x6,x5) & n_guitar(x6) & (x3 = x4) & n_guy(x3)) & (x1 = x2) & n_front(x1) & a_topic(s1))
hypothesis_logic: exists e1 x1 x2.(at(e1,x2) & n_concert(x2) & Actor(e1,x1) & v_perform(e1) & n_people(x1))