When you make the decision to title your song ‘Iron’, you better make sure that it goes hard, and believe me when I say Nicky Romero & Calvin Harris made sure this track does just that. Filled with progressive wonder, sensational build ups, and a dirty amount of wobble; what else could you ask for? How about Calvin Harris throwing in his own vocals on top of all that? Yea he just did that! Not only did he pull it off, but his vocals actually bring this track to the next level. Sounds too good to be true? Go ahead, check it out for yourself!