DJ Frankie Knuckles attends the 2003 Emery Awards at the Capitale in New York City on December 4, 2003Frankie Knuckles, a pioneer of house music who also mixed records for the likes of Michael Jackson and Whitney Houston, has died at the age of 59, news reports said early Tuesday. The death of a man dubbed the “godfather” of Chicago house music was confirmed by his longtime business partner, Frederick Dunson, the Chicago Tribune reported. Dunson said Knuckles died unexpectedly at home. The cause of death for Knuckles, who over the weekend deejayed at the Ministry of Sounds’ club in London, was not immediately known.