I don't know how they pulled it off, but I like that they did. Things like this make the music industry more flexible over time, and is only better for us consumers.

I agree though - I had the same thing happen to me when I logged in today (some music that I bought for others on CD is now "mine" in my cloud library). I also got a bunch more stuff that I had bought for myself though, so overall, I'm happy with it.