A band plays on stage with two people facing each other and singing, one person playing the drums, one on keyboard and one person on guitar.
People are enjoying the music.
Playing on stage does not mean there are people listening.  Playing on stage does not mean people are enjoying the music.
exists e2 e1 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12.(n_drum(x7) & with(e1,x3) & rel(x3,x5) & rel(x5,x8) & subset_of(x11,x8) & on(x11,x12) & n_guitar(x12) & n_person(x11) & card_eq_1(x11) & subset_of(x9,x8) & on(x9,x10) & n_keyboard(x10) & n_thing(x9) & card_eq_1(x9) & Theme(e2,x7) & Actor(e2,x6) & v_play(e2) & (x5 = x6) & n_person(x5) & card_eq_1(x5) & all x15 x14 x13.((n_singing(x15) & n_other(x14) & subset_of(x15,x13) & subset_of(x14,x13)) -> exists e3.(Theme(e3,x13) & Actor(e3,x4) & v_face(e3))) & (x3 = x4) & n_people(x3) & card_eq_2(x3) & on(e1,x2) & n_stage(x2) & Actor(e1,x1) & v_play(e1) & n_band(x1))
exists e1 x1 x2.(n_music(x2) & Theme(e1,x2) & Actor(e1,x1) & v_enjoy(e1) & n_people(x1))