Charlie Kubal, better known by his stage name wait what, is a San Francisco music producer specializing in mashups, most notable for his creation of the notorious xx. The album paired the music of The Notorious B.I.G. with the debut album of The xx and was named "the best mashup album of 2010"by The Guardian. He has released three albums and has performed with artists including Lil Wayne, Wiz Khalifa, Mötley Crüe, and Taking Back Sunday.