Sign Language was my favorite way to teach the children the songs. Some kids would sing and sign, some would just sing, and some would just sign. Sign language helps the kinesthetic learners and visual learners. The singing helps the auditory learners. So all three learning styles are incorporated through singing and using sign languages.
The LDS videos are found at https://www.lds.org/children/videos-music/asl?lang=eng.
I do not know how to sign fluently. I would watch the ASL LDS Videos frame by frame and then write it up so I could remember. Each song took several hours to write up frame by frame. Some of the videos that I watched on VHS (LOL) and DVD are different then the current LDS versions on the lds.org website, but these explanations combined with the videos should help get you started with the Sign Language.
If any of you choristers are fluent in Sign Language and Want to Help with This Project for Other Choristers, please contact me at email@example.com. I would love for other songs to be added or any other song that correspond with the ASL videos on lds.org.