"Sing" is My Chemical Romance's fourth track and second single from their fourth and final studio album, Danger Days: The True Lives of the Fabulous Killjoys. The official single artwork was posted on the band's website on October 2010. "Sing" marks the first time a song of the band has reached adult contemporary stations; it began airplay through Chicago radio station WCFS-FM by March 2011.

The song was the second-best selling rock song of 2011 in the UK, ahead of Paramore's "Monster" and behind Foo Fighters' "Rope".

The song debuted on BBC Radio 1 and subsequently on the band's MySpace and several other radio stations on November 3, 2010. The song was released on iTunes the same day. The song has been described as "poppy" and with a "surprising different sound than previous MCR tracks" by Wendy Rollins of Philadelphia's Radio 104.5. Dan Martin from NME reviewed the album and said the following of the song: "Starting off synthy, slinky and just a little bit funky, 'Sing' then erupts into another euphoric call to mass doing-stuff-together as waves of filthy bass cascade around Gerard as he sings, "You've got to be what tomorrow needs" as he dodges elephant-stomp drums." Trash Hits said of the song: "This is a slower, smouldering effort which jangles in a Depeche Mode style while Gerard Way murmurs his way through." This was also the very first song played on new Dayton, OH. Modern AC station WKSW Click 101-5 on Friday, March 25, 2011.

The music video premiered on MTV.com and VH1.com and was directed by Gerard Way and Paul Brown. Picking up after the events of the "Na Na Na (Na Na Na Na Na Na Na Na Na)" music video, "Sing" opens with My Chemical Romance as their alter-egos (The Fabulous Killjoys) driving down a freeway tunnel on their Pontiac Firebird with brief "television advertisement" clips from Better Living Industries (BL/ind), running over a BL/ind security guard and a draculoid at a toll booth/checkpoint. The band arrives in the album's dystopia known as Battery City, stopping in front of BL/ind headquarters.

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