The people who have been doing this work for longer than I have are numerous.
I found this organization when I was working in Davis, CA on my last tour. I was introduced to a member of the local choir by an old high school friend. I like the fact that this network of choirs is coast to coast and has more than a 130 chapters.
http://thresholdchoir.org
Or on Facebook
https://www.facebook.com/ThresholdChoir
From their own website:
"Threshold Choir is a network of a cappella choirs of primarily women's voices:
a community whose mission is to sing for and with those at the thresholds of life.
Founded in 2000, more than 130 choirs now serve their local communities, nationwide and worldwide."
Let me know if you want to get involved on the road or in your home town!