How do I play MP3s from my Dropbox? I have the Dropbox app on my Droid, and it can "download" files to the local storage on the phone, but for some reason, the music player app can't see those files.  

How do I make the music playing app see the mp3s in my Dropbox? Is there an alternative way I should think about the problem or sync the files?
In Dropbox, simply add MP3s to favorites and they become available in a stock Google Play Music application (Tested in Android ICS)