An old man in a nursing home is described as being depressed, unresponsive and 'un-alive' until he hears music from his era. When his caretaker puts the headphones on him and flips on the iPod, you can see the pure joy on his face. So awesome.
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I read somewhere that your musical taste never changes after age 27. Which sounds right - all the good music styles were from the late 60's through the mid-70's.