i just created an account to say you are a genius and your idea is ahead of its time! well done; if i was a betting man, i'd bet there will be a commercial solution one day but unfortunately not today 
i googled exactly this and found your post. it reminds me that about 20 years ago i was bringing my pc to friends parties as an mp3 music jukebox. great idea!
i googled exactly this and found your post. it reminds me that about 20 years ago i was bringing my pc to friends parties as an mp3 music jukebox. great idea!