Question: What is the name of the song that includes both the vocals of Daya and the duo the Chainsmokers?
Context: "Sit Still, Look Pretty" is a song by American singer Daya.  It was released on March 29, 2016, as the second single from her debut extended play (EP), "Daya" (2015) and her debut studio album of the same name (2016).  It is the follow-up to her "Billboard" Hot 100 top 40 hit "Hide Away".  The song was written by Gino Barletta, Mike Campbell and Britten Newbill.  Lyrically, the song includes themes of female empowerment. "Setting Fires" is a song by American DJ duo The Chainsmokers, released as a promotional single from the duo's second extended play, "Collage" (2016).  It features the vocal collaboration of American electronic music duo XYLØ.  The song was written by Melanie Fontana, Jon Asher and Andrew Taggart.  "Setting Fires" was released on November 4, 2016, through Disruptor Records and Columbia Records. "Closer" is a song by American DJ duo The Chainsmokers, featuring American singer Halsey.  Andrew Taggart (one half of The Chainsmokers) also provides his vocals in the song.  It was released on July 29, 2016, through Disruptor Records and Columbia Records.  The song was written by Andrew Taggart, Ashley Frangipane, Shaun Frank, Freddy Kennett, Isaac Slade and Joe King, while the production was handled by The Chainsmokers.  Musically it is an EDM song with a "retro" style synthesizer in the chorus. "New York City" is a song by American DJ duo The Chainsmokers.  It features uncredited vocals from American singer Victoria Zaro.  It is the fifth, and last, single from the duo's first EP "Bouquet EP".  The song peaked at number 25 on the "Billboard" Dance/Electronic Songs chart and number 80 on the 2016 Dance/Electronic Songs year-end chart. American singer Daya has released one studio album, one extended plays and three singles.  Her debut single "Hide Away" became an international hit, it peaked in the top 40 in eight countries including the US.  In November 2015, her debut self-titled EP released.  The next single "Don't Let Me Down" which featured the duo The Chainsmokers, became an international big hit, it peaked in the top 10 in 20 countries, including the US and the UK, has sold three million copies worldwide.  The follow-up "Sit Still, Look Pretty" has since peaked at number 28 on the "Billboard" Hot 100.  Her debut studio album "Sit Still, Look Pretty" was released on October 7, 2016, with the promotional single "Cool".  Daya released her third single "Words" on November 15, 2016. Grace Martine Tandon (born October 24, 1998), professionally known as Daya (pronounced ), is an American singer and songwriter from Pittsburgh, Pennsylvania.  She is signed to Artbeatz, Z Entertainment, and RED Distribution, and released her self-titled debut extended play (EP), "Daya", on September 4, 2015, which includes the song "Hide Away", which has peaked at number 23 on the "Billboard" Hot 100.  She released her debut studio album "Sit Still, Look Pretty" on October 7, 2016. "All We Know" is a song by American DJ duo The Chainsmokers.  It features vocals from Andrew Taggart (one half of The Chainsmokers) and American singer Phoebe Ryan.  The song was released on September 29, 2016, through Disruptor Records and Columbia Records. Scott Harris Friedman is an American multi-platinum songwriter, producer, and musician best known for his work with Shawn Mendes and co-writing hit song "Don't Let Me Down" by The Chainsmokers featuring Daya, which reached #1 on the US Mainstream Top 40 chart in 2016.  Harris has 10 songs on Shawn Mendes' sophomore album "Illuminate" including the lead single "Treat You Better" which reached the top 3 at the US Mainstream Top 40 chart, "There's Nothing Holdin' Me Back which hit number 1 at the US Mainstream Top 40 chart and 10 songs on Shawn Mendes' debut album Handwritten which debuted at number 1 on the "Billboard" 200.  Harris has also written songs for a number of artists, including Jessie J, Melanie Martinez, X Ambassadors, and Tiesto; he co-wrote every song on The Shawn Mendes EP in 2014, which debuted at number five on the "Billboard" 200. "Something Just like This" is a song by American electronic music duo The Chainsmokers and British rock band Coldplay.  It was released as the second single from The Chainsmokers' debut album "Memories...Do Not Open" on February 22, 2017 and as the first single from Coldplay's thirteenth extended play "Kaleidoscope" as the Tokyo Remix on June 23, 2017.  The song was used as the theme for the 2017 NCAA Division I Men's Basketball Tournament.  A live remix recorded in Tokyo of Coldplay's live version of the song was released on June 23, 2017. "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 on March 22, 2016, as the radio single follow-up to "Roses".
Answer: Don't Let Me Down