Question: Katie White and Ian Brown, have which occupation in common?

full_context: Document 1: The Ting Tings: The Ting Tings are an English indie pop duo from Salford, Greater Manchester. The band consists of Katie White (vocals, guitar, bass drums, bass guitar, cowbells) and Jules De Martino (drums, lead guitar, bass guitar, vocals, piano).
Document 2: KT Tunstall: 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".
Document 3: Hands (The Ting Tings song): "Hands" is a song by English duo The Ting Tings. The song was written by both Katie White and Jules De Martino and mixed by label-mate Calvin Harris. The single was released to radio airplay on 18 August 2010 after premiering on the Huw Stephens show on BBC Radio 1 at 9:30 pm; a remix was also be released for free via digital download on 11 October 2010 on the band's Facebook page. The song was performed at the Wireless Festival, as part of the setlist; they were joined with dancers holding signs, saying work, which when flipped around, would say dance. The song debuted at number 29 on the UK Singles Chart. The line spoken by De Martino at the start of the song, "I don't want to go out. I want to stay in." is a reference to the same line spoken in the David Bowie song "Modern Love".
Document 4: Katie Melua: Ketevan "Katie" Melua ( ; Georgian: ქეთევან „ქეთი“ მელუა ; ] ; born 16 September 1984) is a Georgian-British singer, songwriter and musician. She moved to Northern Ireland at the age of eight and then to England at fourteen. Melua is signed to the small Dramatico record label, under the management of composer Mike Batt, and made her musical debut in 2003. In 2006, she was the United Kingdom's best-selling female artist and Europe's highest selling European female artist.
Document 5: Ian Ball: Ian Thomas Ball (born 19 October 1975) is an English musician, most notable for being part of the indie rock band Gomez, sharing lead vocals and guitars. He has also performed and released two solo albums (as of June 2017). He is also a member of the 14 piece supergroup Operation Aloha (album). along with fellow Gomez member Olly Peacock.
Document 6: Ian Brown: Ian George Brown (born 20 February 1963) is an English musician. He is the lead singer of the alternative rock band the Stone Roses from their formation in 1983. Following the split he began a solo career, releasing six studio albums, a greatest hits compilation, a remix album and 17 singles. He has performed solo shows in 45 countries. He returned to singing for the Stone Roses on 19 October 2011. On 20 October, he put out a statement to say that although he had reunited with the band, it did not spell the end of his solo endeavours. Brown is also known for a cameo role in "Harry Potter and the Prisoner of Azkaban".
Document 7: Great DJ: "Great DJ" is the second single by English indie pop band The Ting Tings. Vocalist Katie White states that the song was written by "playing a D chord on the guitar for hours, because that's all I could play. And then I put my finger on the wrong string, and got what I discovered was an augmented chord. And that was the riff!" The single was originally released as a double A-side along with "That's Not My Name".
Document 8: Ian McCulloch discography: The discography of the British singer Ian McCulloch consists of four studio albums, one compilation album, and nine singles. While he was still the lead singer of the band Echo & the Bunnymen, McCulloch released his debut solo single, a version of the standard "September Song", in 1984 which reached number fifty-one on the UK Singles Chart.
Document 9: The Stone Roses: The Stone Roses are an English rock band formed in Manchester in 1983. They were one of the pioneering groups of the Madchester movement that was active during the late 1980s and early 1990s. The band's most prominent lineup consists of vocalist Ian Brown, guitarist John Squire, bassist Mani, and drummer Reni.
Document 10: The Ting Tings discography: The discography of The Ting Tings, an English indie pop duo, consists of three studio albums, three extended plays, ten singles and fourteen music videos. The Ting Tings were formed in 2004 in Salford, England by Jules De Martino and Katie White. The band was signed to independent record label Switchflicker Records in 2006 and released their limited-edition debut single, "Fruit Machine", the following year. Following an appearance at the Glastonbury Festival in 2007, The Ting Tings were signed to Columbia Records.
Document 11: Can't See Me: "Can't See Me" is a song by Ian Brown. It was written by Brown and Mani and produced by Brown. The song was remixed by Bacon & Quarmby and released as the third single from Brown's debut solo album "Unfinished Monkey Business". It was released in June 1998, and rose to number 21 on the UK Singles Chart. The song's lyrics refer to an incident when Brown saw His former Stone Roses band-mate John Squire in a village in Hale, Greater Manchester, not long after the split of the band. According to this story, Brown waved to Squire, but Squire hid behind a newspaper and would not acknowledge him.
Document 12: Unfinished Monkey Business: Unfinished Monkey Business is the debut solo album by Ian Brown released in February 1998 via Polydor Records. The album was self-financed and produced by Brown, and was his first album release since the break-up of The Stone Roses in October 1996. Ex-Roses members Mani, Nigel Ipinson, Aziz Ibrahim and Robbie Maddix helped pen and perform the instruments on many of the album's tracks. "Ice Cold Cube", which premiered at The Stone Roses final concert, was first released on this album.
Document 13: Katie White: Katie Rebecca White (born 18 January 1983) is a British musician and member of the pop duo the Ting Tings. After some success with a girl group punk trio TKO, which supported Steps and Atomic Kitten, her father David White brought in Jules De Martino to write songs for TKO. Katie and De Martino subsequently formed the Ting Tings in 2007.
Document 14: Golden Greats (Ian Brown album): Golden Greats is the second solo album released by Ian Brown, a first made famous by his role as frontman in The Stone Roses. Despite the title, the album is not a compilation, but rather, a studio album. It was described by "NME" as "a left-field masterpiece and Brown's best work for a decade", contains soaring sonic textures and electronic dance beats; it is less song-oriented than "Unfinished Monkey Business". "Golden Greats" showcases a diverse usage of instruments including strings, mellotron and organs. A number of the tracks on the album were written by Brown whilst he was imprisoned for two months following a fracas with a flight attendant.
Document 15: That's Not My Name: "That’s Not My Name" is the third single by British duo The Ting Tings from their debut studio album "We Started Nothing". Vocalist Katie White states that the song was written "with me ranting about my frustrations with the record industry." The song was originally released as a double A-side with "Great DJ" by independent record label Switchflicker Records on 28 May 2007. After heavy promotion from BBC Radio 1 and the "NME", the single was re-released individually on 12 May 2008 on Columbia Records.
ground_truth: musician