Question: Which band, Marianas Trench or Car Seat Headrest, signed to Matador Records in 2015?

full_context: Document 1: Twenty One Pilots discography: American musical duo Twenty One Pilots have released four studio albums, one live album, seven extended plays, fifteen singles and eighteen music videos. The band was formed in 2009 and currently consists of Tyler Joseph and Josh Dun. They put out two self-released albums, "Twenty One Pilots" in 2009 and "Regional at Best" in 2011, before being signed by Fueled by Ramen in 2012. They released their third studio album, "Vessel", with Fueled by Ramen in 2013. Their fourth studio album, "Blurryface", was released on May 15, 2015 through the same label. On November 25, 2016, they released "Blurryface Live", a three-LP, Tri-Gatefold Picture Disc Vinyl featuring the live audio recorded during a concert at The Fox Theater in Oakland, CA.
Document 2: Teens of Style: Teens of Style is the 9th studio album by American indie rock band Car Seat Headrest, released on October 30, 2015. It was their first album recorded for Matador Records. Intended as an introductory compilation for new listeners, it features reworked newly recorded versions of songs originally released between 2010 and 2012, with the addition of one new composition.
Document 3: Blameshift: Blameshift is a four-piece rock band from Long Island, New York that started in 2005. The band consists of Jenny Mann, Tim Barbour, Mike Sarkissian and Dan Scofield. The band is recognized for their work ethic, extensive touring history and high energy live show. In 2006 they recorded a self released album, “Drop Down”. The release was followed by over 150 tour dates including three dates on the Warped Tour. In 2007 Blameshift recorded their second album. “The Test” with Michael Birnbaum and Chris Bittner. The album was nationally released through Smart Punk, F.Y.E, Hot Topic, and iTunes. Alternative Press named Blameshift as “Unsigned Band Of The Month” in August 2008. Blameshift won a contest through Taco Bell called “Feed The Beat” in 2008. Michael Birnbaum and Chris Bittner also produced the single, The Sirens Are Set in 2008. Blameshift toured through all of 2008 in the U.S. and Canada with And Then There Was You, and The Material on the Everlasting Sound Tour. At the start of 2009 producer Mike Watts demoed the bands’ Self Titled EP. With touring in between with Sky Tells All and The Material, the release of the EP was put on hold until February 2010. In May 2010 the band raised $5500 through Kickstarter to record with producer / engineer Erik Ron in Hollywood, California. In June 2010 the band signed with Restless Management out of Venice Beach, California.
Document 4: Aquarium Drunkard: Aquarium Drunkard is an online music blog launched in 2005 by Justin Gage, and based in Los Angeles, California. As of January 7, 2017, it has an Alexa Rank of 69,035 in the United States, and 245,172 worldwide. The name "Aquarium Drunkard" comes from a lyric by the band Wilco. The website was originally created by Gage to share music with his friends, but by 2006 the site was being read by a worldwide audience. In 2009, in an essay for The Observer's Music Monthly supplement, Nick Hornby, author of High Fidelity, listed Aquarium Drunkard among his six favorite music blogs. According to Rolling Stone, a post on Aquarium Drunkard of a demo by Alabama Shakes helped the band get their first record deal.
Document 5: Marianas Trench discography: The discography of Marianas Trench, a Canadian pop rock band, consists of four studio albums, three extended plays, 18 singles and 18 music videos. The band recorded and released their debut EP in 2002, entitled "Marianas Trench" containing 8 tracks.
Document 6: The Ready Set: Jordan Mark Witzigreuter (born November 14, 1989), known professionally as The Ready Set, is an American singer-songwriter from Fort Wayne, Indiana. He is the lead vocalist and sole member of the act, using a backup band while on tour. Witzigreuter created The Ready Set in the basement of his childhood home in Fort Wayne, Indiana. He has released four studio albums "Tantrum Castle", "I'm Alive, I'm Dreaming," "The Bad & The Better", and "I Will Be Nothing Without Your Love," four extended plays and seven singles. Fall Out Boy bassist Pete Wentz signed The Ready Set to his label Decaydance Records, in 2009. He is currently with Hopeless Records.
Document 7: Car Seat Headrest: Car Seat Headrest is an American indie rock band originally from Leesburg, Virginia, United States, currently based in Seattle, Washington. Begun as a solo recording project in 2010 by Will Barnes (born August 23, 1992), known professionally as Will Toledo, Car Seat Headrest released 12 albums on the music platform Bandcamp. Signed to Matador Records in 2015, Car Seat Headrest began a tour in 2016 presenting material from their latest album "Teens of Denial" as a full band. Toledo's work is notable for its large online cult following. The group has received attention from publications including "Pitchfork", "Rolling Stone", "The New Yorker" and "Paste", amongst others.
Document 8: Something Old / Something New: Something Old / Something New is the third extended play recorded by Canadian rock group Marianas Trench, released May 26, 2015 through 604 Records, Cherrytree Records, and Interscope Records. It contains two songs originally recorded for the band's fourth studio album, "Astoria" (2015), and two tracks that pre-date the recording of their debut studio album, "Fix Me" (2006), from their Self-Titled EP "Marianas Trench" (2002). The EP was released in promotion of "Astoria" and serves as a "thank you" to their fans.
Document 9: Short Stack: Short Stack is an Australian pop punk band, formed in 2005. The band consists of members Shaun Diviney, Andy Clemmensen and Bradie Webb. Their touring members included Luke Lukess, Sinj Clark, Lewis Usher, and Chris Smith. Shannon Hotchkins was also a member of Short Stack before any song was ever performed or recorded. Short Stack were twice named Channel V Oz Artist of the Year, and produced two gold-selling albums, three top ten singles, and ARIA number one chart award and a platinum-selling single. The group split in 2012, and released their third album the following year without any promotion. In April 2014, the band announced their reformation and shortly released "Television". "Amy" was released as the lead single from fourth album "Homecoming" (2015).
Document 10: Hey Ocean!: Hey Ocean! is a Canadian indie alternative rock/folk and synthpop band formed in 2004 in Vancouver. David Beckingham and Ashleigh Ball had been friends since grade 6, joining with David Vertesi in the 2000s to form the band. The band consists of Ashleigh Ball (vocals/flute), David Beckingham (vocals/guitar), and David Vertesi (vocals/bass). Their music draws from many genres, including pop and acoustic, and the group tours Canada widely. They have performed locally alongside other Vancouver acts such as Shad K, Mother Mother and Said the Whale.
Document 11: The Head and the Heart: The Head and the Heart is an American indie folk band. They were formed in the summer of 2009 by Josiah Johnson (vocals, guitar, percussion) and Jonathan Russell (vocals, guitar, percussion). The band also includes Charity Rose Thielen (violin, guitar, vocals), Chris Zasche (bass), Kenny Hensley (piano), and Tyler Williams (drums). The band is signed to Warner Bros. Records and have released three albums thus far. Since March 2016, Johnson has been on hiatus due to drug addiction-related issues. The band has toured in both North America and Europe.
Document 12: Teens of Denial: Teens of Denial is the tenth studio album by American indie rock band Car Seat Headrest. It was released on May 20, 2016 by Matador Records, serving as the band's second album for the label and the first to consist of newly recorded material.
Document 13: Never Say Die Tour (Marianas Trench tour): The Never Say Die Tour (Marianas Trench) is a Canadian concert tour by Canadian pop-rock band Marianas Trench (band) in support of their album "Astoria (Marianas Trench album)".
Document 14: Face the Music (EP): Face the Music: The EP (also known as Face the Music) is the title of the second extended play released by Canadian pop-rock group Marianas Trench. Featuring popular songs from the group's most recent album, "Ever After" (2011), the EP marks Marianas Trench's first official US music release. It was first released May 10, 2013 in New Zealand before being released in North America later that month, and was distributed through 604 Records, Cherrytree Records, and Interscope Records.
Document 15: Marianas Trench (band): Marianas Trench is a Canadian pop punk band from Vancouver, British Columbia, formed in 2001. The band consists of members Josh Ramsay (lead vocalist, rhythm guitarist, pianist, songwriter, and occasional drummer), Matt Webb (lead guitarist and backing vocalist), Mike Ayley (bass guitarist and backing vocalist), and Ian Casselman (drummer, percussionist, and backing vocalist). The band has released four full-length studio albums, the most recent titled "Astoria", released on October 23, 2015, along with 2011's "Ever After", 2009's "Masterpiece Theatre" and 2006's "Fix Me". Their third album "Ever After" was nominated for a Juno Award.
ground_truth: Car Seat Headrest