© Licensed to London News Pictures. 31/05/2014. Barcelona, Spain.   Nine Inch Nails performing live at Primavera Sound festival Day 4.  Nine Inch Nails (abbreviated as NIN) is an American industrial rock band, founded in 1988 by Trent Reznor who is its main producer, singer, songwriter, and instrumentalist.  Primavera Sound, or simply Primavera, is an annual music festival that takes place in Barcelona, Spain in late May/June within the Parc del Fòrum leisure site. Photo credit : Richard Isaac/LNP