Nine Inch Nails does not play the same in concerts than when they do in studios. Reznor makes and plays most of the band's music. Other people might sing or play instruments if it is needed for the song. Reznor makes groups of backing musicians (people who play for concerts). Alessandro Cortini (one of the band's keyboardists) said that how the band plays in studios and in CDs is different from how they play in concerts.