Yes. Obviously. I should have been downloading the tracks I was listening too and wring my own scripts to parse and save my playlist data with the full expectation that the service I had been paying for would be terminated without warning...

Guess I'll know for next time.

There were add-ons to seamless download songs as you played them, as we as playlists

Honestly, yes. Even if you were paying money for it, Grooveshark was blatantly, flagrantly illegal.