Hmmm! I see no reason the songs can't be incorporated as written in the book, lyrics and all. So maybe I just misinterpreted your point Odo

. But you confuse me when you say "choreography", implying a song and dance routine in the Musical Tradition. Also by suggesting it could be like The Wizard of Oz.
I really enjoyed the way singing was handled in LotR. It seemed natural and unforced, and was completely integrated into the story, whether it was Sam adding his verse to the Elven Lament, or Pippin's jawdroppingly heartbreaking ballad

, or Merry and Pippin's Booze Fueled Pub Song and Dance

.
A Musical Number on the other hand takes one completely out of a story. Everything stops for 5 minutes or so, while people sing dialogue at each other, and dance troupes invade the screen

.
What if I pose the question this way: Do you want Disney's Snow White and the Seven Dwarfs, or something more realistic that simply incorporates the actual lyrics from the book (which I would totally second if that's what you mean)?
GB