The Double Black Album is a remix of vocals from Jay-Z's Black Album with music built from samples of Metallica's Black Album. Cheap Cologne then received legal threats from the RIAA, this forced him to remove the album from his web page. The next week he then received a phone call saying that the letter had been a "mistake".
The Grey Album is a remix of Jay-Z's Black Album with the Beatles White Album this is created by DJ Danger Mouse. EMI, which claims to hold the copyright to the recording of the White Album, tried to censor the album in February 2004 by sending cease and desist letters to Danger Mouse, independent record stores, and websites.