That moment when Spotify, TuneIn, and Slacker are available...and I have a Pandora account. LOL.
I did the same but was lucky enough to only have 230 songs in my thumbs up playlist. I was able to transfer 200 for free, so just added the additional. Folllowing the artist stations was easy enough to do.I used Soundiiz to migrate 700+ thumbed up Pandora songs over to Spotify premium. Cost me $5 for 1 month of service even though I only needed it for 15 minutes... But it was good enough to save my 7 years of music preferences.