Who produced the mixtapes 63 and 19 which includes a collaboration with an American hip hop group from New York City known as the Beastie Boys?
63/19:  The albums include collaborations with Pictureplane, Young L, SKYWLKR, Keyboard Kid, Trackademicks, Fat Tony, Mike Finito, Lakutis and Spank Rock as well as a beat Ad-Rock of the Beastie Boys originally made for Das Racist.
i don't know