Question: Canadian singer Claire Elise Boucher who wrote the album "Art Angels" under what stage name?

Context paragraphs:
Kay (singer): Kay Boutilier (born July 31, 1985) better known by her stage name, My Name Is Kay, or just simply as Kay, is a Canadian singer and songwriter.  Born and raised in Reserve Mines, Nova Scotia, she left Cape Breton Island after graduating from Holy Angels High School in 2005.  A struggling artist, Kay eventually moved to Vancouver, B.C., and turned to the Internet to widen her audience and increase her chances of being discovered.  Her first music video, released for her debut single “My Name Is Kay”, turned into a YouTube sensation, with hits topping 480,000.  The song also charted on the Canadian Hot 100, debuting at No. 80, and peaking at No. 63.  She now tours Paris as a DJ, under the name yung goldilox.

Rue des cascades: Rue des cascades (English: "Cascade Street") is the second studio album by the musician and composer Yann Tiersen.  It was released through Sine Terra Firma in 1996, and subsequently reissued in 1998, 2001, and 2009 through Ici, d'ailleurs... and Virgin Records in CD and double LP formats.  The album, with the exclusion of two pieces, "Naomi" and "La Vie quotidienne", is a collection of short pieces recorded with toy piano, harpsichord, violin, accordion, mandolin, and other conventional and unconventional musical instruments such as an old typewriter in "Pas si simple".  The title track, which was used about one year later for the film score of the Palme d'Or nominated French drama film "The Dreamlife of Angels", was sung by French soloist singer Claire Pichet, who also provided vocals on the track "Naomi", a song that features words from Allen Ginsberg's poem "Kaddish".  François-Xavier Schweyer played the cello on "C'était ici" and "La Fenêtre".  Three tracks, "J'y suis jamais allé", "Pas si simple", and "Soir de fête", will find a wider audience five years later when they were featured on the soundtrack to Jean-Pierre Jeunet's acclaimed film "Amélie".

Realiti (Grimes song): "Realiti" (stylized as "REALiTi") is a song by Canadian singer Grimes.  Originally slated for release on her scrapped fourth studio album, it was released as a YouTube video on March 8, 2015 as a thank you to her fans in Asia.  The song was later announced to be included on her 2015 album "Art Angels".  The demo version was included as a bonus track on the CD release of the album.

King of Kings Transport: King of Kings Transport Inc. (more commonly known as Philippine Corinthian Liner Inc.) was a Philippine bus company operated by singer Claire de la Fuente.  It was established in 1993, has plied along EDSA corridor but the name has been dropped in 2003 due to financial instability and large amounts of credit borrowed from other individuals to establish a long-dreamed business.  The name Philippine Corinthian Liner Inc. was used until it became defunct in November 2011.

Grimes (musician): Claire Elise Boucher (born March 17, 1988), better known by the stage name Grimes, is a Canadian record producer, songwriter, music engineer, singer, video director and editor, and visual artist.

Flesh Without Blood: "Flesh Without Blood" is a song by Canadian singer, songwriter and music producer Grimes, released on October 26, 2015 as the lead single from her fourth studio album, "Art Angels" (2015).  The same day, Grimes released the "Flesh Without Blood/Life in the Vivid Dream" video to YouTube, a double music video featuring "Flesh Without Blood" and "Life in the Vivid Dream", another song on "Art Angels".

Claire (album): Claire is the debut studio album by English actress and singer Claire Sweeney, released by Telstar Records in 2002.

Art Angels: Art Angels is the fourth studio album by Canadian singer and songwriter Claire Boucher, professionally known as Grimes.  It was digitally released on November 6, 2015 by 4AD, and in physical formats on December 11.  Boucher began planning the record in 2013 as the follow-up to her third studio album "Visions", however she scrapped most of the material from these sessions and began a new set of recordings in 2014.  The track "Realiti", which came from the earlier recordings, was released as a demo in early 2015.

Art Angel: "Not to be confused with" Art Angels, "a studio album by Grimes."

Hana (EP): Hana (stylized as HANA) is the self-titled debut EP by American singer, songwriter and producer Hana.  The EP was self-released on March 25, 2016.  Music videos for "Underwater", "Chimera", and "Avalanche" were featured in a short film alongside videos from Grimes' album "Art Angels", entitled "The Acid Reign Chronicles".  The short film was released on October 5, 2016.

Supporting paragraphs: Realiti (Grimes song) Grimes (musician)
Answer: Grimes