Title: Don't Let Me Down (Lotta Engberg and Christer Sjögren song)
Content:  "Don't Let Me Down" is a song written by Lars Diedricson and Lasse Holm, and performed by Lotta Engberg and Christer Sjögren at Melodifestivalen 2012, where it was performed during the 4th semifinal in Malmö. Reaching Andra chansen, it was knocked out by Thorsten Flinck's Jag reser mig igen. On 18 March 2012 the song was tested for Svensktoppen. entering the chart the upcoming week. The song charted at Svensktoppen for three weeks. before being knocked out. The song lyrics is based on media gossip about a relationship between the performers in an early 1990s dansband Sweden.
Title: Don't Let Me Down (Will Young song)
Content:  "Don't Let Me Down" is a song written by Richard Stannard, Julian Gallagher, D. Morgan, Will Young, and Simon Hale and performed by Young. It was released as his fourth single on 18 November 2002 along with the track "You and I". It reached number two on the UK Singles Chart. The double A-side single was released in aid of Children in Need. CD2 included a limited edition poster.
Title: Don't Let Me Down (Beatles song)
Content:  "Don't Let Me Down" is a song by the English rock band the Beatles, recorded in 1969 during the Let It Be sessions. It was written by John Lennon and credited to Lennon–McCartney. The band recorded the song with Billy Preston; the single release with "Get Back" was credited to "the Beatles with Billy Preston".
Title: Don't Let Me Down (The Farm song)
Content:  "Don't Let Me Down" is a single by Liverpool-based pop group the Farm released as the third and final single from their album Spartacus. It was released on 22 April 1991 (eight days before the album itself), having been produced by Graham "Suggs" McPherson of Madness. The single reached #36 on the UK Singles Chart. The foot featured on the cover of the single is that of John Goldsmid, a model, socialite, and fashion designer, who was renting a studio next to the Farm's when the record was released.
Title: Won't Let You Down
Content:  "Won't Let You Down" is a song by Australian hip hop group Hilltop Hoods featuring Irish-English singer-songwriter Maverick Sabre, released through Golden Era Records on 27 June 2014 as the lead single from their seventh studio album Walking Under Stars (2014). "Won't Let You Down" peaked at number 17 on the ARIA Singles Chart, marking the group's fifth top 40 single.
Title: Don't Let Me Down (Milky Chance and Jack Johnson song)
Content:  "Don't Let Me Down" is a song by German folk group Milky Chance and American singer-songwriter Jack Johnson. The song was released on 1 May 2020 and the music video premiered on Milky Chance's YouTube channel. The song reached number one on the US Adult Alternative Songs chart in July 2020.
Title: Don't Let Me Down (Leona Lewis song)
Content:  "Don't Let Me Down" is a song recorded by British singer-songwriter Leona Lewis for her second studio album Echo (2009). Lewis co-wrote the song with Mike Elizondo, James Fauntleroy, Justin Timberlake and Robin Tadross. It was produced by The Y's and co-produced by Elizondo. Lewis and Timberlake carried out the vocal production. Having wanted to work with Timberlake for a long time, the collaboration came to be after he had asked Lewis to perform at a charity concert he was holding in Las Vegas in October 2008. It was reported that they were going to cover Dolly Parton's song "I Will Always Love You" as a duet, however they worked together on new 
Title: Don't Let Me Down (Eskimo Joe song)
Content:  "Don't Let Me Down" is a song by Australian band, Eskimo Joe. It was released digitally in September 2009 as the third and final single from their fourth studio album Inshalla. The song peaked at number 50 on the ARIA charts. Eskimo Joe performed the song on the first reunion show of the Hey Hey It's Saturday on 30 September 2009.
Title: Don't Let Me Down (The Chainsmokers song)
Content:  "Don't Let Me Down" is a song by American production duo the Chainsmokers. The song features the vocals of American singer Daya, and was released on February 5, 2016, through Disruptor Records and Columbia Records. The song was written by Andrew Taggart, Emily Warren and Scott Harris. It was released as the radio single follow-up to "Roses". "Don't Let Me Down" became both the Chainsmokers' and Daya's first top-five single on the US Billboard Hot 100, peaking at number three. It also became the Chainsmokers' second consecutive top 10 entry after "Roses", which peaked at number six. It reached the top 10 in several countries, including Australia, Austria, Canada, Germany, New Zealand, Sweden, and the United Kingdom. A set of remixes for the song, was released on April 15, 2016. A music video for the song was released on April 29, 2016, with appearances from the Chainsmokers and Daya. The song won a Grammy Award for Best Dance Recording.
Title: Emily Warren
Content:  Tritonal's "Until You Were Gone", which featured Warren's lead vocals. Her performance was immediately praised by Nylon, which wrote: "Her delivery is filled with a longing that packs a strong punch." Additionally, The Chainsmokers hailed Warren as "one of the best songwriters and vocalists that they had ever worked with". Shortly after, Warren teamed up again with Scott Harris and together they wrote "Don't Let Me Down" with The Chainsmokers, which reached number 3 and went on to reach triple platinum in the United States. It was both The Chainsmokers and Daya's first top 5 on Billboard Hot 100. "Don't Let Me 

Question: who sings war don't let me down?
Answer: American production duo The Chainsmokers.
vocals of American singer Daya.