Question: Daniel Johns and Justin Currie both did what in their respective music groups?

full_context: Document 1: Iain Harvie: Iain Wallace Harvie (born 19 May 1962 in Glasgow, Scotland) is the guitarist with the Scottish rock band Del Amitri. Along with lead singer and bassist Justin Currie, Harvie is one of only two members to be present throughout Del Amitri's history since its 1982 inception. He is also the co-writer, with Currie, of many of the group's songs.
Document 2: What Is Love For: What is Love For is the first solo album by singer/songwriter Justin Currie, best known for his involvement in the band Del Amitri.
Document 3: Del Amitri discography: The discography of Del Amitri, a Scottish pop rock band formed in 1983, includes six studio albums, one live album, two compilation and 19 singles. Four of their studio albums reached the top 10 in the UK Albums Chart. Their first album, which is a self-title album released in May 1985 did not enter the UK Albums Chart at all, and their final studio album "Can You Do Me Good?", released in 2002, peaked at number 13. The band's most successful studio album was their third "Change Everything", which reached second place in the UK Albums Chart. Also the band's compilation album, "Hatful of Rain: The Best of Del Amitri", got to fifth place in the UK Albums Chart. The band broke up in 2002. They played a reunion gig at The Hydro Glasgow on 24 January 2014. A live album, "Into the Mirror", recorded on the reunion tour in January and February 2014 was released on 20 October 2014.
Document 4: Danny Spencer: Danny Spencer is the former guitarist for Rogue Traders, taking over from previous guitarist Tim Henwood, who left in order to concentrate on his band The Androids in 2007. With Rogue Traders frontman James Ash stating that "Tim Henwood will be leaving the Rogue Traders in the immediate future to concentrate on his own amazing band, The Androids" on the bands MySpace page.
Document 5: Dan Hawkins (musician): Daniel Francis Hawkins (born 12 December 1976 in Chertsey, England) is an English rock guitarist, best known as a guitarist and backing singer of the UK band, The Darkness. The band fronted by his older brother Justin Hawkins, achieved notable mainstream success between 2002 and 2006. He also plays lead guitar for Stone Gods. He is influenced by hard rock and glam metal genre such as Led Zeppelin, Aerosmith, Def Leppard, Whitesnake, AC/DC, Queen, Mötley Crüe and Thin Lizzy.
Document 6: The Great War (album): The Great War is the second solo album by singer/songwriter Justin Currie, best known for his involvement in the band Del Amitri.
Document 7: Del Amitri: Del Amitri is a Scottish alternative rock band, formed in Glasgow, Scotland in 1983. The band grew out of Justin Currie's Jordanhill College School band and came together after a teenaged Currie placed an advertisement in the window of a music store asking for people who could play to contact him. The band was formed with the original line-up of Currie (bass and vocals), Iain Harvie (lead guitar), Bryan Tolland (guitar) and Paul Tyagi (drums). Currie and Harvie were the only members of the band to remain present throughout its history. They were also the main songwriters of the group.
Document 8: Silverchair: Silverchair were an Australian rock band, which formed in 1992 as Innocent Criminals in Merewether, Newcastle with the line-up of Ben Gillies on drums, Daniel Johns on vocals and guitars, and Chris Joannou on bass guitar. The group got their big break in mid-1994 when they won a national demo competition conducted by SBS TV show "Nomad" and ABC radio station, Triple J. The band were signed by Murmur, and were successful on the Australian and international rock stages.
Document 9: John Christ: John Christ (born John Wolfgang Knoll on February 19, 1965) is a musician best known as the original guitarist for the metal band Danzig. He has been known for his bluesy hard rock sound and frequent use of the pinch harmonic. Christ was ranked 63rd in "Guitar World's" list of 'The 100 Greatest Metal Guitarists'.
Document 10: Justin Currie: Justin Robert Currie (born 11 December 1964) is a Scottish singer and songwriter, best known as a founding member of the band Del Amitri and, along with Iain Harvie, is one of only two members of the group to be present throughout its entire existence.
Document 11: Danny Jones: Danny Jones (born 12 March 1986) is a British musician who is one of the lead vocalists and guitarists for pop-rock band McFly. Jones' fellow band members are Tom Fletcher (guitar and vocals), Dougie Poynter (bass and vocals), and Harry Judd (drums).
Document 12: Daniel Johns: Daniel Paul Johns (born 22 April 1979) is an Australian musician, singer, and songwriter. Best known as the former front man of the rock band Silverchair, Johns is also one half of The Dissociatives with Paul Mac and, in 2007, was ranked at number 18 on "Rolling Stone"' s list of The 25 Most Under-rated Guitarists.
Document 13: Lower Reaches: Lower Reaches is the third solo album by singer/songwriter Justin Currie, best known for his involvement in the band Del Amitri.
Document 14: Michael Johns (singer): Michael Johns (born Michael John Lee; 20 October 1978 – 1 August 2014) was an Australian singer who finished in eighth place on the seventh season of "American Idol", in 2008. In 2009, he released a music album, "Hold Back My Heart," which sold 20,000 copies. Johns died on 1 August 2014, at the age of 35 of dilated cardiomyopathy.
Document 15: Angus Young: Angus McKinnon Young (born 31 March 1955) is an Australian guitarist, best known as the co-founder, lead guitarist, songwriter and sole constant original member of the Australian hard rock band AC/DC. He is known for his energetic performances, schoolboy-uniform stage outfits and his own version of Chuck Berry's duckwalk. Young was ranked 24th in "Rolling Stone" magazine's 100 greatest guitarists of all-time list.
ground_truth: singer and songwriter