I stumbled upon this video of an old man listening to music. He can't stop singing and dancing but before his music, he was sad, depressed and could barley talk.
Once he hears music from his era he starts talking and answering questions.
I hope Apple and other mp3 companies donates a lot of there players to nursing homes. This is such a great thing!
Watch this video... FWD to 2:30 and you can see how he transforms when he hears music.