Sony confirmed Monday that hackers infiltrated their servers and stole more than 50,000 music filed, including a large number of unreleased tracks from deceased pop icon Michael Jackson.  The story was first reported Sunday by UK newspaper The Sunday Times, which claimed the cyber-theft took place last April when hackers found a way into Sony's PlayStation Network and stole user information for some 77 million users.  other than to confirm the report, Sony declined to comment further.