our incredible cnn heroes. after carol rosenstein's husband was diagnosed with dementia, she began to feel him slipping away and started to lose hope. then one day, he sat down at the piano. >> i was seeing something magical happening before my eyes. the doctor told me that we were watching the power of music changing brain chemistry. playing a musical instrument is like a full-body workout for the brain. the music actually resurrected him. >> to learn more about this story or to nominate someone you think should be a cnn hero, logon to cnnheroes.com. you're in the cnn newsroom. i'm ana cabrera in new york. thank you so much for being here. the news this hour, fresh