This can't be for real, can it? Have you been unwittingly downloading tracks from The Overdub Tampering Committee?
"We are a group of musicians who have downloaded newly leaked albums by popular artists, quickly recorded many subtle overdubs, and then re-leaked it to the internet. We have done this for about three years now."
I'd love it if this was genuine but surely if it was they would have put at least one example of their work on the blog?