Four teenagers having a blast in a basement playing the video game Rock Band.
A boy takes piano lessons.
It is four teenagers, not a single boy. And playing a video game is not the same as taking piano lessons.
exists e1 e2 x1 x2 x3 x4 x5 x6 x7 x8 x9.(ne_per_band(x6) & (x6 = x9) & ne_per_rock(x9) & of(x6,x8) & n_game(x8) & of(x6,x7) & n_video(x7) & a_topic(x1) & Theme(e2,x3) & Actor(e2,x2) & v_have(e2) & in(x3,x4) & Theme(e1,x6) & Actor(e1,x5) & v_play(e1) & (x4 = x5) & n_basement(x4) & n_blast(x3) & (x1 = x2) & n_teenager(x1) & card_eq_4(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_lesson(x2) & of(x2,x3) & n_piano(x3) & n_boy(x1))