"Iron" is a song by Nicky Romero and Calvin Harris. The song was released as a single via Beatport. It became the second single to be released through Romero's label Protocol Recordings (after "WTF!?" with ZROQ), and the first single from the label to reach #1 on Beatport's Top 100 chart.[1] A shortened version of the song was later included in Harris' third studio album 18 Months.
Composition
The majority of the song has an upbeat electro house style until vocals from Harris come in. When the vocals do come in, the background tune is just a piano being played until Calvin Harris sings "Our hearts will never be the same again". After this happens, the tune becomes upbeat again.
Swedish DJ Alesso has criticized the song for being a copy of his own track "Clash".