Two questions come to mind after reading that article:

1. Suppose I composed and memorized songs about my loved ones, and years from now began to suffer from Alzheimer's - would those songs help me remember who they are?

2. Suppose I taught someone just diagnosed with Alzheimer's a song. Will they continue to remember it as the disease progressively got worse?

This is an amazing discovery - I hope they continue to follow up on their work.