Bang Bang… is this the holy grail? Jay-Z’s ‘Magna Carta Holy Grail’ “leaked” overnight and features the likes of Frank Ocean, Nas, Justin Timberlake, Beyonce, Pharrell & Timbaland. Stream first single off the album Jay-Z ‘Holy Grail’ feat. Justin Timberlake right here: Hot & Delicious.. social media strategy, music news & sick live photography from…