From Hacking The Soul:
Dawning Of The Day Of Aquarius (DOTDOA) looks up a 'numeroscope' reading based on your birthday and generates a playlist in iTunes on the Mac. The app requires you to create 9 playlists of your own (each one representing a set of forces that will guide days of that type). Each time you run the app, it reads your numeroscope to you, determines which playlist represents the day you are supposed to have, and grabs a song from that playlist and makes a genius playlist based on that song. Then you have your sound track for the day. The songs are all placed in a special playlist for you, so you can easily take your mood with you on your iPod.