Nine Inch Nails - We're In This Together - piano cover. Nine Inch Nails - Lights in the Sky - piano cover. System Of A Down - Toxicity - piano cover. Playing System Of A Down - Chop Suey in Poznan (Democamp, October 23, 2010) Hot Violin Girls System of a Down Cover. Nine Inch Nails - March Of The Pigs - piano cover.