Frank Zappa’s band The Mothers of Invention, now called The Grandmothers of Invention’, will continue to tour after performing live throughout 2013. The Grandmothers of Invention features Napoleon Murphy Brock, a member of the Mothers from 1974-1984 and Don Preston, who was a Mother from 1966-1974. The Grandmothers started to perform again in 2002 after