When you have about an hour or so you may want to listen to this. It's a five second excerpt of every Billboard #1 Hit from 1956 to 1992 played in sequence.
http://stereogum.com/644712/every-1-song-ever-five-seconds-at-a-time/mp3s/
http://stereogum.com/644712/every-1-song-ever-five-seconds-at-a-time/mp3s/