Our Gregorian schola once sang a recital in a government-run nursing home.
Some of the patients with Alzheimer’s, some advanced, spontaneously sang along with us. They knew the words, and the melodies. A haunting and moving experience.
Side note, the home was a former seminary. The recital was in the historic chapel. It has been deconsecrated but remains a protected heritage site so the architecture remains intact. It is mainly used for concerts and recitals with emphasis on religious music. We’ve sung there a couple of times since but the complex is no longer a nursing home.