In 2009, Trent Reznor shocked his fans by deciding to stop touring with his band Nine Inch Nails. Instead, he turned his attention to other projects, which included co-composing the Oscar-winning score to the 2010 film “The Social Network.” But now he’s brought the band back to life with a new CD called “Hesitation Marks” - and VOA’s Katherine Cole says the new songs were worth waiting for.