『x』（マルティプライ）は、エド・シーランの2枚目のアルバム。2014年6月20日にAsylum Records、Atlantic Recordsより発売。

概要 
前作「The Slumdon Bridge」から2年ぶりのアルバム。タイトル「x」は1枚目のアルバム「+」でやったことを基にしてそれを何倍にするという意味。このアルバムに向けて120曲も制作し、選曲の基準は「500回聴いても飽きない曲」だという。

2015年の「第57回グラミー賞」では「最優秀アルバム賞」と「最優秀ポップ・ボーカル・アルバム」にノミネートされた。

現在までに全世界で1250万枚以上のセールスを記録している。

収録曲 
 One [4:13]
Produced by Jake Gosling
(作詞・作曲：Ed Sheeran)
 I'm a Mess [4:06]
Produced by Jake Gosling
(作詞・作曲：Ed Sheeran)
 Sing [3:55]
Produced by Pharrell Williams
(作詞・作曲：Ed Sheeran, Pharrell Williams / 編曲：Andrew Coleman)
2014年4月7日にリリースの先行シングル。プロデューサーにPharrellが参加。知り合うきっかけはグラミー賞の授賞式でPharrellがEdの後ろに座っており、Edが挨拶したところ、「一緒にスタジオに入ろう」と言われたという。EdのギターのカッティングをPharrellが気に入りこの曲が生まれた。Edは「オーディエンスに参加してもらうための曲。みんな一緒に歌ってほしい」。
 Don't [3:39]
Produced by Benny Blanco, Rick Rubin
(作詞・作曲：Ed Sheeran, Benjamin Levin, Ali Shaheed Muhammad, Conesha Owens, Dawn Robinson, Raphael Saadiq)
2014年8月12日にシングルとしてリリースされた。Lucy Pearlが2000年にリリースした「Don't Mess with My Man」をサンプリングしている。もともとRick Rubinのバージョン、Benny Blancoのバージョンの2種類を制作したが、どちらも気に入ってる箇所があり、それぞれのキーとなる要素を組み合わせれば、とてもクールなサウンドになると思い、両方のバージョンを採用した。
 Nina [3:43]
Produced by Jake Gosling
(作詞・作曲：Ed Sheeran, Johnny McDaid, Isra Andja-Diumi Lohata, Jay Lee Robert Hippolyte, Jermaine Scott)
Wretch 32が2008年に発表した「Welcome to My World」をサンプリングしている。
 Photograph [4:18]
Produced by Jeff Bhasker
(作詞・作曲：Ed Sheeran, Johnny McDaid / Strings Arrangement：Davide Rossi)
2015年6月18日にシングルとしてリリースされた。
 Bloodstream [4:59]
Produced by Rick Rubin
(作詞・作曲：Ed Sheeran, Gary Lightbody, Johnny McDaid, Rudimental)
2015年3月29日にシングルとしてリリースされた。
 Tenerife Sea [4:00]
Produced by Rick Rubin
(作詞・作曲：Ed Sheeran, Foy Vance, Johnny McDaid)
 Runaway [3:26]
Produced by Pharrell Williams
(作詞・作曲：Ed Sheeran, Pharrell Williams / 編曲：Andrew Coleman)
 The Man [4:09]
Produced by Jake Gosling
(作詞・作曲：Ed Sheeran)
 Thinking Out Loud [4:41]
Produced by Jake Gosling
(作詞・作曲：Ed Sheeran, Amy Wadge)
2014年9月25日にシングルとしてリリースされた。Edがこのアルバムでお気に入りの楽曲。
 Afire Love [5:14]
Produced by Johnny McDaid
(作詞・作曲：Ed Sheeran, Foy Vance, Johnny McDaid, Christophe Beck)
ドラマ「Buffy the Vampire Slayer」の劇中歌「Remembering Jenny」をサンプリングしている。

デラックス・エディション
 Take It Back [3:28]
Produced by Rick Rubin
(作詞・作曲：Ed Sheeran, Johnny McDaid)
 Shirtsleeves [3:09]
Produced by Jake Gosling
(作詞・作曲：Ed Sheeran)
 Even My Dad Does Sometimes [3:48]
Produced by Jake Gosling
(作詞・作曲：Ed Sheeran, Amy Wadge)
 I See Fire [4:57]
Produced by Ed Sheeran
(作詞・作曲：Ed Sheeran)
映画「ホビット 竜に奪われた王国」主題歌。

デラックス・フィジカル・エディション
 All of the Stars [3:55]
Produced by Johnny McDaid
(作詞・作曲：Ed Sheeran, Johnny McDaid)
映画「きっと、星のせいじゃない。」劇中歌。

クレジット 

 One
 Ed Sheeran：Vocals, Guitar
 Jake Gosling：Programming, Drums, Strings, Horns
 Mixed by Mark 'Spike' Stent
 Engineer：Jake Gosling
 Assisted Engineer：Adam Coltman
 Mastered by Stuart Hawkes

I'm A Mess
 Ed Sheeran：Vocals, Guitar, Handclaps
 Chris Leonard：Electric Guitar, Bass, Handclaps
 Jake Gosling：Programming, Drums, Percussion, Piano, Handclaps
 William Hicks：Additional Vocal Edited
 Mixed by Mark 'Spike' Stent
 Engineer：Jake Gosling, Geoff Swan
 Mastered by Stuart Hawkes

Sing
 Ed Sheeran：Vocals, Guitar
 Andrew Coleman：Additional Guitar, Digital Edited
 Recorded by Andrew Coleman
 Assisted Recorded by Ramon Rivas, Rob Sucheki
 Mixed by Mark 'Spike' Stent
 Engineer：Geoff Swan
 Mastered by Stuart Hawkes

Don't
 Ed Sheeran：Vocals, Guitar, Instrumentation, Programming
 Jason Lader：Bass
 Adam MacDougall：Keyboards
 Jason Lader：Keyboards
 Lenny Castro：Percussion
 Luis Conte：Percussion
 Benny Blanco：Instrumentation, Programming
 Rick Rubin：Instrumentation, Programming
 Christian 'Leggy' Langdon：Digital Edited
 Eric Caudieux：Digital Edited
 Sean Oakley：Digital Edited
 Assistant Produer：Johnnie Burik, Ricardo Kim
 Co-Ordination：Andrew "McMuffin" Luftman, Sief "Mageef" Hussain
 Co-Ordinator：Dave Hanych
 Additional Recorded by Eric Lynn, Joshua Smith, Sean Oakley
 Mixed by Mark 'Spike' Stent
 Mastered by Stuart Hawkes
 Engineer：Chris "Anger Management" Sclafani, Geoff Swan, Jason Lader, Matty Green, William Hicks
 Additional Vocal Engineer：William Hicks
 Incorporating Elements：Lucy Pearl「Don't Mess with My Man」

Nina
 Ed Sheeran：Vocals, Acoustic Guitar, Electric Guitar, Handclaps
 Jake Gosling：Programming, Drums, Percussion, Piano, Synthesizer, Handclaps
 Chris Leonard：Acoustic Guitar, Bass, Handclaps
 Ed Howard：Handclaps
 Mixed by Mark 'Spike' Stent
 Engineer：Geoff Swan, Jake Gosling
 Assitant Engineer：Matthew Gooderham
 Mastered by Stuart Hawkes
 Contains Sample：Wretch 32「Welcome to My World」

Photograph
 Ed Sheeran：Vocals, Acoustic Guitar
 Tyler Sam Johnson：Electric Guitar
 Jeff Bhasker：Piano, Keyboards, Electric Bass
 Emile Haynie：Drum Programming
 Tyler Sam Johnson：Drum Programming
 Additional Producer：Emile Haynie
 Mixed by Mark 'Spike' Stent
 Engineer：Geoff Swan, Tyler Sam Johnson
 Mastered by Stuart Hawkes

Bloodstream
 Chris Dave：Drums
 Adam MacDougall：Keyboards
 Eric Lynn：Keyboards
 Jason Lader：Keyboards
 Johnny McDaid：Keyboards
 Lenny Castro：Percussion
 Luis Conte：Percussion
 Christian 'Leggy' Langdon：Digital Edited
 Eric Caudieux：Digital Edited
 Sean Oakley：Digital Edited
 Assistant Producer：Johnnie Burik, Ricardo Kim
 Co-Ordinator：Dave Hanych
 Recorded by Jason Lader
 Mixed by Mark 'Spike' Stent
 Engineer：Geoff Swan
 Mastered by Stuart Hawkes

Tenerife Sea
 Ed Sheeran：Vocals, Guitar
 Blake Mills：Guitar
 Jason Lader：Bass
 Chris Dave：Drums
 Adam MacDougall：Keyboards
 Eric Lynn：Keyboards
 Jason Lader：Keyboards
 Johnny McDaid：Keyboards
 Lenny Castro：Percussion
 Luis Conte：Percussion
 Christian 'Leggy' Langdon：Digital Edited
 Eric Caudieux：Digital Edited
 Sean Oakley：Digital Edited
 Assistant Producer：Johnnie Burik, Ricardo Kim
 Co-Ordinator：Dave Hanych
 Recorded by Jason Lader
 Additional Recorded by Sean Oakley
 Assisted Recorded by Eric Lynn, Joshua Smith, Sean Oakley
 Mixed by Mark 'Spike' Stent
 Engineer：Geoff Swan
 Mastered by Stuart Hawkes

Runaway
 Ed Sheeran：Vocals, Guitar
 Andrew Coleman：Additional Guitar, Digital Edited
 Recorded by Andrew Coleman
 Assistant Recorded by Ramon Rivas, Rob Sucheki
 Mixed by Mark 'Spike' Stent
 Engineer：Geoff Swan
 Mastered by Stuart Hawkes

The Man
 Ed Sheeran：Vocals, Guitar
 Chris Leonard：Guitar, Acoustic Guitar Solo
 Jake Gosling：Programming, Drums, Rhodes
 Mixed by Mark 'Spike' Stent
 Engineer：Jake Gosling
 Additional Vocal Engineer：William Hicks
 Mastered by Stuart Hawkes

Thinking Out Loud
 Ed Sheeran：Vocals, Guitar
 Chris Leonard：Electric Guitar Solo, Bass, Hammond Organ
 Jake Gosling：Programming, Drums, Percussion
 Peter Gosling：Piano
 Mixed by Mark 'Spike' Stent
 Engineer：Geoff Swan, Jake Gosling
 Mastered by Stuart Hawkes

Afire Love
 Ed Sheeran：Vocals, Guitar
 Foy Vance：Backing Vocals
 Geoff Leaa：Drums
 Johnny McDaid：Guitar, Bass, Backing Vocals, Percussion, Piano, Programming, Hammond Organ
 Davide Rossi：Strings
 Coco Arquette：Additional Vocals, Percussion
 Courtney Cox：Additional Vocals, Percussion
 Eamon Harkin：Additional Vocals, Percussion
 Mixed by Mark 'Spike' Stent
 Engineer：Geoff Swan, Johnny McDaid
 Mastered by Stuart Hawkes
 Contains Elements：Buffy the Vampire Slayer「Remembering Jenny」

Take It Back
 Ed Sheeran：Vocals, Guitar
 Mixed by Ruadhri Cushnan
 Assisted Mixed by Grant Rawlinson
 Mastered by Stuart Hawkes

Shirtsleeves
 Ed Sheeran：Vocals, Electric Guitar Solo
 Jake Gosling：Programming, Drums, Percussion
 Mixed by Ruadhri Cushnan
 Assisted Mixed by Grant Rawlinson
 Mastered by Stuart Hawkes

Even My Dad Does Sometimes
 Ed Sheeran：Vocals
 Chris Leonard：Electric Guitar Solo, Acoustic Guitar
 Jake Gosling：Programming, Drums, Bass
 Amy Wadge：Piano
 Mixed by Ruadhri Cushnan
 Assisted Mixed by Grant Rawlinson
 Engineer：Jake Gosling
 Mastered by Stuart Hawkes

I See Fire
 Ed Sheeran：Vocals, Guitar, Violin
 Nigel Collins：Cello
 Recorded by Graham Kennedy, Steve Gallagher
 Mixed by Kirsty Whalley, Pete Cobbin
 Mastered by Stuart Hawkes

All Of The Stars
 Mixed by Ruadhri Cushnan
 Engineer：Johnny McDaid
 Mastered by Stuart Hawkes
 Recorded
 Sticky Studios (#1, 2, 5, 10, 11, 14, 15) 
 Jungle City Studios (#3, 9)
 Matza Ball Studios (#4)
 Rocket Studios (#4)
 Shangri-La Studios (#4, 7, 8)
 Enormous Studios (#6)
 Cocoloco Studios (#12)
 Sphere Studios (#12)
 Metropolis Studios (#12)
 Park Road Post (#16)
 Mixed
 The Mix Suite