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The Alzheimer's Society also runs the Singing for the Brain project - and there's a local charity, Mindsong, which takes music therapists and singing groups into care homes around the Gloucesteshire area. If you'd like to know more about volunteering for Mindsong please do get in touch with them.
You will receive training, and then be allocated to a group running a fortnightly hour-long singing session in a care home near you. It's fun, rewarding and very worthwhile.