<P> After the success of previous singles, "Money on My Mind" and "Stay with Me" on the UK Singles Chart - with both becoming number - one singles, while the latter a worldwide hit - Smith announced that "I'm Not the Only One" was going to be the album's third single and that it would be released on 31 August 2014 to digital download in the United Kingdom . He chose the song to be released as a single since it was one of the songs that both his fans and himself loved . He commented: "I just wanted to bring out a song that is classic and that had longevity to it . If you listen to the record, there's a few songs on there I actually think would be safer bets to go in terms of radio, but I wanted to make a statement . I also want people to know that I'm not just doing it to have big radio hits . I want people to buy into the album and I feel like' I'm Not the Only One' is an album - seller ." On 10 September 2014, a remix version of the song featuring American rapper A $AP Rocky was released worldwide through online music stores . Smith recalled that Zane Lowe called him and left a voice mail on his phone telling him the song was a hip - hop track and that he needed a rapper on it, and inspired him to get a rapper and show a different side of the music . The song was released as the second single in the United States, being serviced first to adult alternative radio on 24 September 2014 and later on 1 October 2014 to hot adult contemporary and contemporary hit radio . In Brazil, the song was part of the international soundtrack to the telenovela Babilônia (2015). The song found further fame when performed as part of a "mash - up" with Ed Sheeran's "Thinking Out Loud" by Edinburgh's critically acclaimed Voice of the Town </P> <P> "I'm Not the Only One" was written by Sam Smith with Jimmy Napes, who was also responsible for the song's production along with Steve Fitzmaurice . The latter also recorded and mixed the song at The Pierces Room, London, while the song's strings were arranged and conducted by Simon Hale . The piano - led, marching midtempo soul ballad has strings, drums, piano, percussion, bass guitar and guitar as its main instrumentation with a gospel structure . According to the sheet music published at Musicnotes.com by Universal Music Publishing Group, the song is composed in the key of F major with a tempo of 82 beats per minute . Smiths's vocals range from the note of F to C. He admitted that he vocaled the song when he was hungover, calling his vocals "hungover vocals". As Smith explained in a track - by - track commentary for Digital Spy, "Napes played the chords one day and I was obsessed with them . We wrote a completely different song on top of those chords and it wasn't very good, so we scrapped it . Then two weeks later, I just loved the chords so we returned to them, and then we wrote' I'm Not The Only One' in like an hour ." </P> <P> Lyrically, "I'm Not the Only One" talks about infidelity and betrayal in a relationship, where someone decides to stay with a partner they know is cheating on them . In the chorus, Smith admits: "You say I'm crazy /' Cause you don't think I know what you've done / But when you call me baby / I know I'm not the only one". Smith revealed to Lewis Corner that the song was the only one on the album that is not about his life, but a marriage he observed first - hand, where he put himself into the woman's shoes . He added: </P> <P> It came really naturally! The person I wrote it with, we both knew them and we just vibed off each other . We both had really strong opinions on what the woman was doing . It's quite a complex song . When you listen to it you think it's just bashing a guy for cheating, but it's not, it actually talks more about how the woman's a mug . She knows she's not the only one, but she's never going to leave . I think that's wrong . </P>

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