"Let's have a hymn"

Mrs. G asks for a hymn to be sung, and the song she chooses is "You'll never walk alone" -- which is not a hymn.

The song is originally from the 1945 musical, Carousel .  After this, big stars of the day (Elvis, Sinatra, Garland, etc)  covered the song making it wildly popular.

After that, it became the Liverpool "chant" for football games.

Why then, is this the song chosen to be sung at Gordon's funeral, which seemed to be a traditional latin mass?