Activision has appointed a new head for its Guitar Hero division, reports Edge-Online.  The publisher put chief operating officer David Haddad in charge of its music game business following Dan Rosensweig leaving the company.  Rosenweig had been serving as the Guitar Hero unit’s president and CEO.  Haddad will report to Activision president and CEO Mike Griffith.  Griffith said Haddad’s broad consumer and digital/online experience makes him fit to help improve the unit’s profitability.  Read more at Edge-Online {link no longer active}.