It happened, the worst thing that I could have thought for my RB world. My HD crashed! I lost everything. All of my game progress, all 151 songs gold stared, 100% FC's gone. Over 2000 stars, gone.
My 700 song library, poof! It will take me 3-5 days to download everything again. I started about 1am last night and am up to a bit over 300. I just set up all of my packs and a BF3 update to run through the night.
Thankfully, DICE rocks and keeps my high scores, so at least it's not a total loss. I had some gold star songs that I don't think I can repeat. I was on fire one night and pulled off some stuff I haven't been able to touch since.