Wow that really sucks. I use Rdio daily. It's really good for exploring new music - I've built up a great list of favourites. Is there any way to back that info up locally?
Now I'm looking around to see if it would be possible to import the contents of that CSV into another service. It looks like Spotify has an API to add a track to a user: https://developer.spotify.com/web-api/save-tracks-user/
And there's a third-party API some folks cooked up for Google's service: http://unofficial-google-music-api.readthedocs.org/en/latest...
Might have to play with them this weekend.