People sing with large maroon books.
The people are dancing to the music.
People singing with books implies a choir, they cannot be singing like that and dancing at the same time.
exists e1 s1 x1 x2 x3.(with(e1,x2) & n_book(x2) & of(x2,x3) & n_maroon(x3) & a_large(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sing(e1) & n_people(x1))
exists e1 x1 x2.(n_music(x2) & n_people(x1) & to(e1,x2) & Actor(e1,x1) & v_dance(e1))