Susan nailed it, if you want entertained stay home and pop in a CD, Most go to church not for the music ...A choir will practice their style and their hymns, they don't play it out of the hynn book, Mostly it is use for the congregation to follow the words, they follow the choir and their key ... I have Never seen an organist with the hymn book, they have their sheet music and it was arranged so the congregation can sing along with the words in the hynm book ... That book is suggestions musically and pretty much it.