Question: Are Banks and KT Tunstall both singer-songwriters?

Context articles: KT Tunstall
KT Tunstall's Acoustic Extravaganza
If Only (KT Tunstall song)
(Still a) Weirdo
Banks (singer)
Hold On (KT Tunstall song)
Saving My Face
Other Side of the World
Miracle (KT Tunstall song)
Push That Knot Away

Kate Victoria Tunstall (born 23 June 1975), known by her stage name KT Tunstall, is a Scottish singer-songwriter and musician.
 She broke into the public eye with a 2004 live solo performance of her song "Black Horse and the Cherry Tree" on "Later... with Jools Holland".
KT Tunstall's Acoustic Extravaganza is a collection album by Scottish singer-songwriter KT Tunstall, originally released 15 May 2006 and was originally only available through her website.
 The CD comes with a DVD which includes the making of the album and features about her songs and her equipment, namely her AKAI E2 headrush loop pedal which is known as her "Wee Bastard".
"If Only" is an alternative rock song performed by Scottish singer KT Tunstall.
 The song was written by Tunstall and Jimmy Hogarth for Tunstall's second album "Drastic Fantastic" (2007).
 It was released as the album's third single in the United Kingdom on 3 March 2008.
 "If Only" reached No. 45 on the UK Singles Chart.
"(Still a) Weirdo" is a song by Scottish recording artist KT Tunstall.
 It was released as the UK lead single from her third studio album "Tiger Suit" (2010), on 19 September 2010.
 Written by Tunstall herself and Greg Kurstin, and produced by Kurstin, the song is an acoustic rock ballad and talks about still the same (weird) person after many years.
 It received critical acclaim, with the majority of the critics complimented Tunstall for the ability to make an intelligent, simple song.
 It charted inside the top-forty on the UK Singles Chart at No.39 and currently remains her last UK top 40 hit.
 It charted also on the Belgian charts.
 In the music video, Tunstall travels back in time to the 1960s.
Jillian Rose Banks (born June 16, 1988), known professionally by the mononym Banks (often stylized as BANKS), is an American singer and songwriter from Orange County, California.
 She is signed to Harvest Records and Good Years Recordings.
 Following the release of two extended plays, "Fall Over" and "London", in 2013, Banks released her debut album, "Goddess", on September 5, 2014, to positive reviews from contemporary music critics.
 It reached number 12 on the US Billboard 100, while its most successful single, "Beggin for Thread", was certified gold by the RIAA.
 Her second studio album, "The Altar", was released on September 30, 2016, to a similar positive reception.
"Hold On" is an alternative rock song performed by Scottish singer KT Tunstall.
 The song was written by Tunstall and produced by Steve Osborne for Tunstall's second album "Drastic Fantastic" (2007).
"Saving My Face" is a song performed by Scottish singer KT Tunstall.
 The song was written by Tunstall and produced by Steve Osborne for the Tunstall's second album "Drastic Fantastic" (2007).
 The song's lyrics were inspired by a documentary Tunstall watched on the Discovery Channel "about old women having really disturbing amounts of plastic surgery to look very, very young."
"Other Side of the World" is a song by Scottish singer-songwriter KT Tunstall and is the opening track on her debut album, "Eye to the Telescope".
 It was released 9 May 2005 as the second single from that album and became her top twenty hit on the UK Singles Chart, peaking at number thirteen (see 2005 in British music).
 By mid-September 2006, it was released in the United States and Canada as the third and final single from the album, and the Music Video, which used the radio version of the song, was in rotation on MuchMore Music in Canada.
 It is reportedly one of KT Tunstall's favourite songs.
"Miracle" is a song by Scottish recording artist KT Tunstall for the film "Winter's Tale".
 It was released on February 11, 2014.
 The song is the second soundtrack written and released by Tunstall after "The Kid"'s "Boy", and marks a new orientation in Tunstall's career after her fifth release "Invisible Empire // Crescent Moon".
"Push That Knot Away" is a 2010 song by Scottish singer/songwriter KT Tunstall.
 Though it was not recorded as a single, it is a very important song in her third studio album "Tiger Suit" (2010).
 The song premiered on Tunstall's YouTube channel on 9 July 2010 with a non-official video taken from the documentary "How to Make a Tiger Suit" (available in the Deluxe Edition of the album).
 This is also Tunstall's first attempt at mixing electronica with her music.