They've been preparing every Tuesday for the past four months, learning to belt out favorites like "Singin' in the Rain" and "Bridge Over Troubled Water." Those attending their first Giving Voice concert may not know what to expectit is a dementia-friendly choir, meaning many of the participants have some form of dementia and are joined onstage by caregivers and loved ones. Giving Voice, a nonprofit dedicated to helping people in all stages of memory loss, was founded in 2014 with an initial chorus of 35 members. There are now more than 70 "memory choirs" throughout the world that use Giving Voice's model as the foundation for their programs"and a slew of similar dementia-friendly choirs and bands, including Music Mends Minds, AlzheimHER's Chorus, and The Unforgettables Chorus. The premise of these memory choirs is simple but powerful: Making music is not just a feel-good community activity; it's also a powerful weapon to help preserve memories and enhance brain function. Over 55 million people worldwide are believed to be living with dementia. The success of memory choirs [raises] scientific questions about whether music therapy can rewire the brain in addition to improving mood and fostering community. Borna Bonakdarpour, a behavioral neurologist ... is on a quest to show that social singing can help address some of the underlying causes of the disease, such as decreased mental stimulation, isolation, and inactivity.