What is the real name of the person who released the cappella version of Jay-Z?
Danger Mouse (musician): Brian Joseph Burton (born July 29, 1977), better known by his stage name Danger Mouse, is an American musician, songwriter and record producer. The Grey Album:  It mixes an a cappella version of rapper Jay-Z's "The Black Album" with samples from The Beatles' LP "The Beatles", commonly known as "The White Album".
Brian Joseph Burton