<P> "Hello" was written by Adele and Greg Kurstin and produced by the latter . Kurstin also played bass, guitar, drums, piano and keyboards, while Adele also played drums . "Hello" was written in Chiswick, London, something not normally done by Adele, who said she likes to write her music at home . The writing process for the song was slow, taking six months to complete . Initially Adele and Kurstin started writing the first verse; finishing half of the song, six months later Adele contacted Kurstin to finish the song with her, with Kurstin stating he was not sure "if Adele was ever going to come back and finish it ." </P> <P> "Hello" is a soul piano ballad, played in the key of F minor at a tempo of 79 beats per minute . The repeated chord progression heard in the verse, played by the piano, follows a progression of Fm--A ♭--E ♭--D ♭ . According to Musicnotes.com, Adele's vocals span from F to A ♭ in the song . During the chorus, Adele is heard singing the lines over layers of backing vocals, piano and drums which were described by The Daily Telegraph as leaning "towards a very luscious wall of sound". </P> <P> Lyrically, the song focuses on themes of nostalgia and regret and plays out like a conversation . The song was noted for containing themes of regret and was seen as a follow - up to her single "Someone like You" appearing to reflect on a failed relationship . The song's lyrics were also seen as being conversational, revolving around "all the relationships of her past", ranging from friends, family members and ex-partners . Speaking on the song's lyrical content, Adele told Nick Grimshaw on The Radio 1 Breakfast Show: "I felt all of us were moving on, and it's not about an ex-relationship, a love relationship, it's about my relationship with everyone that I love . It's not that we have fallen out, we've all got our lives going on and I needed to write that song so they would all hear it, because I'm not in touch with them ." According to Adele, the line "Hello from the other side" signifies "the other side of becoming an adult, making it out alive from your late teens, early twenties ." </P> <P> On 18 October 2015, a 30 - second clip of "Hello" was played during a commercial break on The X Factor in the United Kingdom . The commercial teased what was then new material, with her vocals accompanied by lyrics on a black screen . Josh Duboff of Vanity Fair wrote that "the Internet collectively lost its mind" after the broadcast of the trailer . On 22 October, Adele announced the upcoming release of 25 to her fans on Twitter . She also shared that "Hello" would be released on 23 October as the lead single off of the album . On 23 October, Adele joined Nick Grimshaw's show on BBC Radio 1 for the song's premiere . </P>

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