This was arranged more as a serious concert piece due to the fragmented use of the original melody. Against the melody is the reoccurring ground bass performed by the Flugelhorns.
If you need a beautiful slow moving number for your next concert, consider this for it fills your need perfectly.

This arrangement can be found at....
https://trumpetensemblemusic.com/products/nobody-knows-the-trouble-i-ve-seen-cornet-3-flugelhorn-horn-3?_pos=1&_psq=Nobody%20Knows&_ss=e&_v=1.0

Nobody Knows the Trouble I've Seen- Cornet - Flugel Horn Choir

Bruce Chidester