Lingua Ignota

A few years prior to its announcement, Hayter formed the supergroup side project Sightless Pit with Dylan Walker (Full of Hell) and Lee Buford (the Body). The noise project released its debut album Grave of a Dog on February 21, 2020 through Trill Jockey.

After All Bitches Die, Lingua Ignota began working on a full-length album of cover songs that were reinterpreted in her unique music style, often with re-written lyrics. Songs from this session included Eminem's "Kim" and Foreigner's "I Want to Know What Love Is". A split EP with The Rita was released in 2019 that featured covers of Dolly Parton's "Jolene" and Scott Walker's "The Girls from the Streets". With the covers album still unannounced, Lingua Ignota released its third studio album Caligula through Profound Lore on July 19, 2019. The album is about one of her abusive relationships, specifically about "speaking out about abuse and feeling invalidated, and people who I thought were my friends no longer being my friends, and the crushing experience of how that feels."

Kristin Hayter began releasing music in 2017 under the moniker "Lingua Ignota". Literally translating to "unknown language", the name is derived from the sacred constructed language Lingua Ignota created by the German Christian mystic Hildegard of Bingen. She chose this name because of her interest in glossolalia or ecstatic language, relating it the idea of a "possession" or God speaking through a body. She said, "I'm trying to construct something that speaks the unspeakable, and so I use this sort of amalgam of musical devices to make my own sonic language which is meant to also be ecstatic or outside the self." Hayter released her first album under the name Lingua Ignota on Valentine's Day 2017. Titled Let the Evil of His Own Lips Cover Him, 100% of the proceeds were donated to the National Network to End Domestic Violence not-for-profit organization and combined original compositions used in her MFA thesis Burn Everything Trust No One Kill Yourself with a cover of the Inner Circle song "Bad Boys", famous for its use as the opening theme on Cops. There are about 10 songs from Hayter's Burn Everything Trust No One Kill Yourself thesis performance that may be released one day.

Four months later, Lingua Ignota self-released its second album All Bitches Die through Bandcamp in June 2017. The album consists of four "murder ballads" loosely inspired by Angela Browne's 1987 book When Battered Women Kill, a study of victim violence. Hayter was not expecting to tour in support of the album and only expected to sell a few copies, however, word-of-mouth buzz surrounding All Bitches Die eventually made its way to Chris Bruni, owner of the Canadian extreme metal independent label Profound Lore Records. Profound Lore reissued All Bitches Die with updated artwork and a bonus track in 2018. Hayter said of the label: "Lingua Ignota is not a neutral project by any means and I've been asked to tone it down in various capacities since I've started. But Profound Lore only encouraged me to remain uncompromising and brutal, and that was ultimately what sold me to them as a label. I feel like they really believe in my work and won't ask me to dilute it to make it more fashionable or palatable." Lingua Ignota opened for experimental metal band The Body during their North American June–August 2018 tour, who Hayter credits for welcoming her into the experimental metal scene. The Body was touring in support of I Have Fought Against It, but I Can't Any Longer., an album that features guest vocals from Hayter.

Lingua Ignota's two 2017 releases, Let the Evil of His Own Lips Cover Him and All Bitches Die, have been described using a wide range of musical genres, including Baroque, black metal, classical, death industrial, doom metal, electronic, extreme metal, experimental, folk, harsh noise wall, metal, industrial, neoclassical, noise, opera, power electronics and spiritual. Her third studio album Caligula features less industrial and electronic influences. Hayter herself admits she has difficulty describing her musical genre.

Hayter studied interdisciplinary creative arts at the School of the Art Institute of Chicago, earning a Bachelor of Fine Arts, and earned a Master of Fine Arts (MFA) degree in Literary Art from Brown University in Providence, Rhode Island in 2016. She is also classically trained in piano and voice. Her undergraduate thesis, titled Architect and Vapor, deconstructed Johann Sebastian Bach's The Well-Tempered Clavier, and centered its poetry component around anorexia, a disorder Hayter herself endured for over a decade. For her MFA thesis, titled Burn Everything Trust No One Kill Yourself, she created a 10,000-page manuscript (a page count selected because it was approximately Hayter's weight in paper) linking real-world examples of misogyny in music with her own personal life using a Markov chain. In her own words, it was composed of "lyrics, message board posts, and liner notes from subgenres of extreme music that mythologize misogyny, […] [and] court papers, audio recordings, and police filings from my own experiences of violence." In addition to the manuscript, her interdisciplinary performance included music and a black-and-white video projection with footage of serial killer Aileen Wuornos and burning buildings.

Lingua Ignota is known for its energetic and expressionistic live performances. A typical stage setup includes a keyboard with a "believe survivors" sticker and a video projection of violent, beautiful and biblical imagery. Hayter delivers vocals "that oscillate between the venomous and aggressive and the heartbreakingly mournful" and loses control of her body on stage, often hitting herself with objects and leaving bruises. Hayter describes her live performance as an "exorcism" in that, similar to her interest in Hildegard of Bingen's "Lingua Ignota" language given to her by God, she feels like a "conduit" with her performance flowing through her. She says, "I very much try to get to a place where [the performance] no longer feels like me, and where something else is moving through me, whether that's my abuser, or god, or something that can create a voice I wouldn't have myself." Repeatedly performing music about violence and surviving abusers can be emotionally taxing, but Hayter says she is motivated when other survivors tell her how much her music deeply resonates with them. Alexis Marshall of the noise rock band Daughters described Lingua Ignota's music as "truly important", and that, "her live sets are ripe with vulnerability and compassion – terror and anxiety. Her commitment to art and the emotional and physical cost her own performances demand of her, is precisely how it should be done."

Generally, Hayter draws inspiration from people, "who've been through hard shit and keep going. The people who are still strong even if they're struggling to have their voices heard." She first became interested in rock music when she found a cassette tape copy of Nirvana's 1991 album Nevermind left behind by her cousin, and became "obsessed" with Kurt Cobain. She said, "I became enamored of [Cobain] and wanted to be him, wanted to make music like him, wanted to have a voice like him." The interest in Cobain was what inspired her to take singing lessons in grade school. By high school, her music tastes evolved into underground, extreme and complex artists including grindcore band The Locust, extreme metal band Cattle Decapitation, free jazz founder Ornette Coleman, experimental noise musician Aaron Dilloway, and avant-garde musician John Zorn. Both Trent Reznor and Nine Inch Nails had an early influence, and she estimates that she likely saw the music video for "Closer" when she was about 12 years old. She said of Nine Inch Nails seminal 1994 second album: "The Downward Spiral was a gateway into industrial music and then noise and experimental. It's not too difficult to get from Nine Inch Nails to Neubauten to Merzbow." She's particularly influenced by vocalists, including German musician Blixa Bargeld (Einstürzende Neubauten, Nick Cave and the Bad Seeds), German new wave vocalist Klaus Nomi, American composer Cathy Berberian, Hungarian extreme metal vocalist Attila Csihar and Greek-American avant-garde musician Diamanda Galás. Hayter has also studied traditional Bulgarian polyphony.

Kristin Hayter (born 1986) is an American classically trained multi-instrumentalist originally from Southern California and currently residing in Rhode Island. In 2017, she self-released two albums—Let the Evil of His Own Lips Cover Him and All Bitches Die—under the moniker Lingua Ignota (Latin for "unknown language"). Through word-of-mouth, Hayter's music caught the attention of Profound Lore Records, who re-issued All Bitches Die and released her third studio album Caligula in 2019. She draws on her experiences as a survivor of domestic violence for musical and lyrical inspiration, and describes her music as "survivor anthems".

Hayter was born in Del Mar, California in 1986. She felt like she didn't fit in in Southern California and was often bullied. About her hometown, she said: "I think of [Del Mar] as a sort of hell in the way that I was so different than everyone else when I was growing up and couldn't situate myself, couldn't find myself there at all." Hayter was raised Catholic and studied in parochial school until the sixth grade, when she entered the public school system. A teacher noticed her voice's natural vibrato when she was eight years old, which lead to her becoming a church cantor, singing every week at her local church and beginning classical voice training lessons. Despite a religious upbringing, she considered herself to be an atheist for several years starting as a teenager. However in 2019, Hayter became interested in Roman Catholicism (iconography).