Question: What former member of the country group Uncle Tupelo contributed to the album Down in a Mirror: A Second Tribute to Jandek?

full_context: Document 1: Down in a Mirror: A Second Tribute to Jandek: Down in a Mirror: A Second Tribute to Jandek is a tribute album compiled by Moscow, PA-based independent record label Summersteps Records, released as a follow-up to the label's first Jandek tribute, "". As with "Naked in the Afternoon", "Down In A Mirror" features cover versions of songs by the reclusive avant-folk/blues singer/songwriter Jandek. Some of the artists are members of the Summersteps roster or fans forming one-time combos to participate on the album, but the album also features contributions from Wilco's Jeff Tweedy, Six Organs of Admittance (reportedly a favorite modern act of Jandek's, according to the "unauthorized" "Texas Monthly" interview), The Mountain Goats, Kawabata Makoto of Acid Mothers Temple, Lewis & Clarke and Okkervil River.
Document 2: Jeff Tweedy: Jeffrey Scot Tweedy (born August 25, 1967) is an American songwriter, musician, and record producer best known as the singer and guitarist of the band Wilco. Tweedy, originally from Belleville, Illinois, started his music career in high school in his band The Plebes with Jay Farrar, which subsequently after several years formed into the alternative country band Uncle Tupelo. After Uncle Tupelo's fourth studio album, the band broke up in 1994 due to conflict between Tweedy and Farrar, prompting Tweedy to form Wilco, with Farrar forming the band Son Volt. Wilco's first album "A.M.", released in 1995, received mixed reviews from critics, though Wilco later found critical and commercial success on their later albums, most notably with "Yankee Hotel Foxtrot" and "A Ghost Is Born", the latter of which received a Grammy for Best Alternative Album in 2005. Across Tweedy's career he has released fifteen studio albums, including four with Uncle Tupelo, ten with Wilco, and one with his son Spencer, along with numerous collaborations with other musicians, most notably "Mermaid Avenue" with Billy Bragg.
Document 3: A.M. (Wilco album): A.M. is the debut studio album by the American alternative rock band Wilco, released on March 28, 1995, by Sire Records and Reprise Records. The album was released only months after the breakup of Uncle Tupelo, an alternative country band that was the predecessor of Wilco. Prior to its release, there was debate about whether the album would be better than the debut album of Son Volt, the new band of former Uncle Tupelo lead singer Jay Farrar.
Document 4: Ken Coomer: Ken Coomer was the last drummer for the band Uncle Tupelo as well as the drummer for Chicago-based band Wilco until "Yankee Hotel Foxtrot". He was the drummer and co-founder of the Nashville-based band, Clockhammer, in the late 1980s/early 1990s, as well as Buzzkill, during that same time, and he continues to play on various projects.
Document 5: Naked in the Afternoon: A Tribute to Jandek: Naked in the Afternoon: A Tribute to Jandek is a tribute album compiled by Moscow, PA-based independent record label Summersteps Records. The album features cover versions of songs by the reclusive avant-folk/blues singer/songwriter Jandek. Many of the artists are members of the Summersteps roster or fans forming one-time combos to participate on the album, but the album also features contributions from Sonic Youth's Thurston Moore (as part of a one-time combo called Dapper), Low, and Bright Eyes.
Document 6: Perfect as Cats: A Tribute to The Cure: Perfect as Cats: A Tribute to the Cure is a charity record released by Los Angeles indie label Manimal Vinyl on October 28, 2008. It features covers of The Cure favourites by The Dandy Warhols, Bat For Lashes, Kaki King, Devastations, ex-Godflesh frontman, Justin K. Broadrick's Jesu, Rio en Medio, Lewis & Clarke, Sarabeth Tucek, Mariee Sioux, Xu Xu Fang, Blackblack, Gangi, Rainbow Arabia and over 20 more artists and bands. The record was mastered by Xu Xu Fang's Bobby Tamkin. The proceeds of the album went to the Invisible Children charity which works with the war torn youth in Sudan.
Document 7: R. Crumb and his Cheap Suit Serenaders No. 2: R. Crumb and his Cheap Suit Serenaders Number 2 is the second 33⅓ rpm album by the retro string band R. Crumb & His Cheap Suit Serenaders and its subtitle was "Persian Rug, Crying My Blues Away, Moana March and Other Favorites". The album was later retitled Chasin' Rainbows in re-release on CD (Shanachie 6002, 1993 - ASIN: B000000DSO) from Shanachie Records. The band's personnel includes Robert Crumb on lead vocal and banjo, Allan Dodge on mandolin, violin, ukulele and vocals, Robert Armstrong on guitars, accordion, banjo, musical saw and vocals, Terry Zwigoff, who later produced the documentary "Crumb", on cello. Originally released on Blue Goose Records in 1976, this record became a collectible not only for the whimsical string band renditions of and reminiscent of the early 20th century music, but for the cover art drawn by the band's frontman and well-known comics artist Robert Crumb.
Document 8: Loose Fur: Loose Fur is an American rock band comprising Wilco members Jeff Tweedy and Glenn Kotche, and Wilco collaborator Jim O'Rourke. The trio first convened in May 2000 in preparation for a Tweedy performance at a festival in Chicago. Tweedy was offered the opportunity to collaborate with an artist of his choosing, and he decided to work with O'Rourke. O'Rourke brought Kotche to a rehearsal session, and the trio recorded an album's worth of songs. The trio have since released two albums, 2003's "Loose Fur" and 2006's "Born Again in the USA", for Drag City. The band has only toured once.
Document 9: Wilco: Wilco is an American alternative rock band based in Chicago, Illinois. The band was formed in 1994 by the remaining members of alternative country group Uncle Tupelo following singer Jay Farrar's departure. Wilco's lineup changed frequently during its first decade, with only singer Jeff Tweedy and bassist John Stirratt remaining from the original incarnation. Since early 2004, the lineup has been unchanged, consisting of Tweedy, Stirratt, guitarist Nels Cline, multi-instrumentalist Pat Sansone, keyboard player Mikael Jorgensen, and drummer Glenn Kotche. Wilco has released ten studio albums, a live double album, and four collaborations: three with Billy Bragg and one with The Minus 5.
Document 10: Uncle Tupelo: Uncle Tupelo was an alternative country music group from Belleville, Illinois, active between 1987 and 1994. Jay Farrar, Jeff Tweedy, and Mike Heidorn formed the band after the lead singer of their previous band, The Primitives, left to attend college. The trio recorded three albums for Rockville Records, before signing with Sire Records and expanding to a five-piece. Shortly after the release of the band's major label debut album "Anodyne", Farrar announced his decision to leave the band due to a soured relationship with his co-songwriter Tweedy. Uncle Tupelo split on May 1, 1994, after completing a farewell tour. Following the breakup, Farrar formed Son Volt with Heidorn, while the remaining members continued as Wilco.
Document 11: Son Volt: Son Volt is an American alternative country group, formed by Jay Farrar in 1994 after the breakup of Uncle Tupelo.
Document 12: Matt de Jong: Matt de Jong is a graphic designer and art director who specializes in album art and related promotional materials for musicians. He has designed album covers for artists including Cat Power, Clean Bandit, Deerhunter, Future Islands, Little Dragon, The Maccabees, Paolo Nutini, Lee Ranaldo, Ratking, and Vampire Weekend. de Jong is known for working with musicians who have a reputation for being "difficult" and nevertheless creating album art that pleases them. Lionel Skerratt, who co-founded Public Information Records, and Orlando Weeks, lead singer of The Maccabees, are childhood friends of de Jong's.
Document 13: Listen Without Distraction: Argentinean label Dias De Garage released the first-ever tribute to the rock legend Kyuss in July 2004. Titled "Listen Without Distraction", the collection was named after the instructions Kyuss used to give music fans on their albums. This CD contains songs from Argentinean bands and features liner notes by ex-Kyuss bass player Scott Reeder.
Document 14: Mirror Traffic: Mirror Traffic is an album by Stephen Malkmus and the Jicks, released on August 23, 2011 by Matador Records. It is the first collaboration between Stephen Malkmus and producer Beck and also the last album to feature drummer Janet Weiss, who moved on to become a member of Wild Flag. As of November 2013, the album has sold 30,000 copies in the U.S. according to Nielsen SoundScan.
Document 15: Two Steps Forward, One Step Back: Two Steps Forward, One Step Back is the sixth album by Patrick Sky, released as SLIF 2000 on Leviathan Records, identified as "[a] division of Innisfree Inc." on the back sleeve. The sleeve notes and front cover title are a reproduction of Sky's own handwriting, notable especially for his misspelling the word "forward" as "foreward" [sic], though the standard spelling is found on the two sticker labels of the LP itself. The record is noteworthy also because it includes a piano-driven re-recording of Sky's signature song, "Many a Mile," and because of "My Friend Robert," later recorded by George Thorogood. Dedicated "[t]o the loving memory of Mississippi John Hurt," the album features not only a cover photo of the fingerpicking legend with Sky (who produced Hurt's Vanguard albums), but also covers of three John Hurt songs. Other highlights include a cover of Bascom Lamar Lunsford's "I Wish I Was a Mole In the Ground" (Lunsford's version is included in Harry Smith's "Anthology of American Folk Music)" and lighthearted rhinological commentary about David Bromberg in the Sky original "Lucky Me." The album also includes a performance of Sky playing "Lost James Whalen," featuring Sky's vocals as well as his playing of the uillean pipes.
ground_truth: Jeff Tweedy