Question: are Patrick Stump and G.O both singer-songwriters ?

Context articles: List of songs recorded by Fall Out Boy
Gnome Alone
Soul Punk
This City (Patrick Stump song)
Lupe Fiasco's The Cool
Fall Out Boy
Patrick Stump
Truant Wave
Fall Out Boy discography
G.O (singer)

Fall Out Boy is an American pop punk band from Wilmette, Illinois.
 Formed in 2001, the band is composed of vocalist and guitarist Patrick Stump, bassist Pete Wentz, guitarist Joe Trohman and drummer Andy Hurley.
 The group's songwriting is typically led by Wentz (lyrics) and Stump (lyrics/singing), although both Trohman and Hurley are also co-credited for the band's compositions.
 After a number of extended plays (EPs) and a mini album, the band released its debut full-length album "Take This to Your Grave" in May 2003.
 In the same year, the band released a cover of Jawbreaker's "Save Your Generation", as well as the Christmas-themed "Yule Shoot Your Eye Out".
Gnome Alone is an upcoming Canadian-American computer animated musical comedy film directed by Peter Lepeniotis and written by Michael Schwartz and Zina Zaflow from a story by Robert Moreland, and Jared Micah Herman & Kyle Newman.
 The film, produced by 3QU Media, stars the voices of Becky G, Josh Peck, Olivia Holt, George Lopez, and Patrick Stump.
 On July 14, it was confirmed that the film will be released on October 13, 2017.
Soul Punk is the first full-length solo studio album by American recording artist Patrick Stump, the lead vocalist, guitarist and composer of Fall Out Boy.
 It was released in the United States on October 18, 2011 through Island Records.
 Stump's solo project was officially announced in January 2010 and he later revealed his first album's title to be "Soul Punk", his first major musical project since Fall Out Boy's hiatus in late 2009.
 The album features no guest artists (besides a bonus remix track with guest vocals from Lupe Fiasco), and Stump wrote all the tracks and played all the instruments, as well as handling production.
 He characterised the lyrics as being "90% metaphors", with lyrical themes dealing with self-belief, corporate greed, innocence and death.
"This City" is a song by American recording artist Patrick Stump from his debut solo album "Soul Punk" (2011), released on Island Records.
 A remix featuring rapper Lupe Fiasco was released as the album's first single (despite the album being a pure solo effort).
 After finishing his album, Stump decided to re-write "Soul Punk" after coming up with "This City".
Lupe Fiasco's The Cool (commonly referred as The Cool) is the second studio album by Chicago-native rapper Lupe Fiasco.
 It was released on December 18, 2007, by 1st & 15th Entertainment and Atlantic Records.
 Recording sessions took place during 2006 to 2007, with Lupe Fiasco himself, alongside Charles Patton (Chilly) serving as the records executive producers.
 The concept album, "The Cool" was based upon the song and a title character from his debut album, "Food & Liquor" (2006).
 The album features guest appearances from Gemini, Snoop Dogg and Matthew Santos, while the production was provided by Patrick Stump, Soundtrakk and Unkle, among others.
Fall Out Boy is an American rock band formed in Wilmette, Illinois, a suburb of Chicago, in 2001.
 The band consists of lead vocalist and rhythm guitarist Patrick Stump, bassist Pete Wentz, lead guitarist Joe Trohman, and drummer Andy Hurley.
 The band originated from Chicago's hardcore punk scene, with which all members were involved at one point.
 The group was formed by Wentz and Trohman as a pop punk side project of the members' respective hardcore bands, and Stump joined shortly thereafter.
 The group went through a succession of drummers before landing Hurley and recording the group's debut album, "Take This to Your Grave" (2003).
 The album became an underground success and helped the band gain a dedicated fanbase through heavy touring, as well as some moderate commercial success.
 "Take This to Your Grave" has commonly been cited as an influential blueprint for pop punk music in the 2000s.
Patrick Martin Stumph (born April 27, 1984), known professionally as Patrick Vaughn Stump, is an American singer-songwriter, multi-instrumentalist, record producer, actor, and music critic.
 He is the lead vocalist and rhythm guitarist for the rock band Fall Out Boy, originally from Wilmette, Illinois.
Truant Wave is the first EP by the American musician Patrick Stump, the lead singer/guitarist of Fall Out Boy.
 It was first released as a digital download exclusive to iTunes on February 22, 2011, through Stump's own record label Nervous Breakdance Media, before becoming available from all online retailers on 9 March.
 It was announced on Stump's website a week before its release date, with little lead up and "absolutely zero promotion" and was unexpected by fans as Stump had never made any mention of it.
The American rock band Fall Out Boy has released six studio albums, two live albums, one compilation album, five extended plays, twenty-one singles, and thirty-three music videos.
 Since their formation in 2001, Fall Out Boy have sold over 7.5 million albums worldwide.
 The band was formed in Wilmette, Illinois by friends Joe Trohman and Pete Wentz, who had played in local Chicago hardcore punk and heavy metal bands; Patrick Stump was soon recruited as the band's lead singer.
 They debuted with the split EP "Project Rocket / Fall Out Boy" (2002) and the mini-LP "Fall Out Boy's Evening Out with Your Girlfriend" (2003), both released on Uprising Records.
 After the release of the latter, drummer Andy Hurley joined Fall Out Boy and Stump picked up guitar, forming the band's current lineup.
 After signing to indie-label Fueled by Ramen, Fall Out Boy released their first full-length studio album, "Take This to Your Grave", in May 2003.
 Following the album's release, the band signed with major label Island Records.
 Their second studio album "From Under the Cork Tree" was released in May 2005 to great commercial success, peaking at number nine on the United States "Billboard" 200 and being certified 2x platinum by the Recording Industry Association of America (RIAA).
 The album's popularity was aided by the success of its first two singles, "Sugar, We're Goin Down" and "Dance, Dance", which both became top ten hits on the US "Billboard" Hot 100 and eventually sold over two million downloads each.
Jung Byung-hee (Hangul:  ; Hanja:  ; November 6, 1987), better known by his stage name G.O, is a South Korean singer-songwriter and actor.
 He is best known as a member of South Korean boy group MBLAQ.