I liked the Grey Album of the Jay-Z/Beatles remixes, but I have to say I think the Black and Blue Album of Jay-Z’s vocals over Weezer music even better. This latter is more of a “mashup” than a “remix”, since the music isn’t really chopped up and recombined into new melodies. As far as I can tell, other than some editing to make the beats match, the underlying music is fairly unchanged. I haven’t heard the originals much lately so that might be an auditory illusion, but it seems that way. Give it a listen, it’s good stuff!