Nas and Def Jam president Jay-Z buried the hatchet last October when Jay-Z invited his former enemy onstage with him at a New Jersey concert. In a further show of peace, Nas has now signed with Def Jam, leaving behind Sony’s Columbia label. His last album, Street’s Disciple II, was released in 2004. http://www.billboard.com/bbcom/news/article_display.jsp?vnu_content_id=1001883225