I just learned that the term for temporarily forgetting a word, the just-the-tip-of-your-tongue problem, is Lethologica.
Researchers have tried playing music to people who have had brain injuries. These people were able to recall new things about their past after listening to the music. These weren’t Alzheimer’s patients. The researchers used top 100 music from each year of the lifetimes of the people. This music seemed to elicit memories of people, or places. They also played music for a control group, and got similar amounts of recollection. More research needs to be done, but it looks like a promising method of restoring the memories of people with brain injuries.