Question: An American indie pop band from Denver, Colorado, United States, made up of husband-and-wife duo released their debut on what date?

Context articles: Carl Butler and Pearl
The City and Horses
Tennis (band)
Oh Honey (band)
Cape Dory (album)
Kisses (band)
Out of the Dust (band)
Some Nights (song)
Beat Happening
Mega Gem

Carl Butler and Pearl was an American country music husband-and-wife duo.
 Between 1962 and 1969, the duo released several singles and charted thirteen times on the U.S. country charts, reaching No. 1 in 1962 with their first single, "Don't Let Me Cross Over".
The City and Horses is an American indie pop band formed in Brooklyn in 2008.
 Led by Marc Cantone (singer/composer) who writes catchy and quirky indie pop songs about breaking up with girls and OCD breakdowns.
 Marc is mostly influenced by The Beatles, The Kinks, The Smiths, Belle and Sebastian, Sebadoh.
 The band has released 3 albums to date.
Tennis is an American indie pop band from Denver, Colorado, United States, made up of husband-and-wife duo Alaina Moore and Patrick Riley.
 The duo formed in 2010, and released their debut album, "Cape Dory", in 2011.
 Their second album, "Young & Old", was released the following year.
 Their third release, "Ritual in Repeat" (2014), was released on Communion records.
 The band's fourth album, "Yours Conditionally", was released in 2017.
Oh Honey is an American indie pop band from Brooklyn, New York formed by singer-songwriters Mitchy Collins and Danielle Bouchard.
 Their touring live band consists of drummer Robbie Ernst.
 Oh Honey describes itself as a blend of folk pop, indie pop, and pop music.
Cape Dory is the debut studio album by American indie pop band Tennis, released on January 18, 2011 on Fat Possum Records.
Kisses is a new wave pop rock duo from Los Angeles, California, formed in 2010.
 The band consists of Jesse Kivel (vocals/lead guitarist) and Zinzi Edmundson (instrumentals/keyboardist).
 The duo released their debut album "The Heart of the Nightlife" on November 8, 2010.
 The duo's second album, "Kids in L.A.", was released on May 14, 2013.
 In addition to Kisses, Kivel is currently a member of the indie pop band Princeton.
Out of the Dust are an American Christian music husband-and-wife duo from Nashville, Tennessee, and Chris Teague and Stephanie Teague started making music together in 2014.
 They released two independently made extended plays, "One Mic, One Night" (2014) and "Lead Me Through" (2015).
 The duo released a studio album, "Out of the Dust" (2017), with Discovery House Music.
"Some Nights" is a song by American indie pop band Fun.
 It was released on June 4, 2012, as the second single from their second studio album of the same name.
 The song was written by Jeff Bhasker, Nate Ruess, Andrew Dost, and Jack Antonoff.
 Musically "Some Nights" is an indie pop song with elements of power pop and afrobeat while the lyrics depict the protagonist having an existential crisis.
Beat Happening is an American indie pop band formed in Olympia, Washington in 1982.
 Calvin Johnson, Heather Lewis, and Bret Lunsford have been the band's continual members.
 Beat Happening were early leaders in the American indie pop and lo-fi movements, noted for their use of primitive recording techniques, disregard for the technical aspects of musicianship, and songs with subject matters of a childish or coy nature.
Mega Gem is an American Indie Pop band founded in 2010 and based in Denver, Colorado.
 On October 19, 2012, Mega Gem released their debut album, Colors of the West, on Wild Baby Records.
 Colors of the West features 33 musicians, including guest a appearance by Stelth Ulvang of the Grammy nominated American folk band The Lumineers While their musical style may vary from traditional punk music, the band is still influenced by the DIY-Punk sub-culture.
 The band's entire discography is available for a pay-what-you-want pricing scale on their Bandcamp page.