Question: Which artist moved toward a progressive, pop sound, Gary Louris or Marc Bolan?
Context: Marc Bolan ( ; born Mark Feld; 30 September 1947 – 16 September 1977) was an English singer-songwriter, musician, guitarist, and poet.  He was best known as the lead singer of the glam rock band T. Rex.  Bolan was one of the pioneers of the glam rock movement of the 1970s.  He died at age 29 in a car accident a fortnight before his 30th birthday. Paul Fenton (born 4 July 1946 in Huddersfield, Yorkshire, England) is an English drummer, best known for his work with T. Rex.  After leaving Christie, he started playing drums for T. Rex in 1973, after being recommended to Marc Bolan by his producer Tony Visconti.  He also toured briefly with Marc Bolan & T. Rex in 1974, and played additional drums with Davy Lutton on the songs "Solid Baby", "Funky London Childhood", and "Visions Of Domino". Marc Bolan's Rock Shrine is the memorial to Marc Bolan where he died when the car in which he was a passenger hit a sycamore tree on Queen's Ride (part of the B306, close to Gipsy Lane) in Barnes, London, on 16 September 1977. Great Jewish Music: Marc Bolan is a tribute album featuring the music of English singer/songwriter Marc Bolan of the band T.Rex.  Produced by Danny Cohen, it was released on John Zorn's label Tzadik Records in 1998 as part of their series on "Radical Jewish Culture", following similar prior tributes to Burt Bacharach and . "Zip Gun Boogie" is a 1974 single, originally credited in the UK as a solo single by Marc Bolan of the British glam rock band T. Rex.  In other territories, the single was credited to "T. Rex" or "Marc Bolan and T. Rex"; almost all reissues of the track credit it solely to T. Rex.  The track and its B-side feature on the 1975 T. Rex album Bolan's Zip Gun. Gary Louris (born March 10, 1955) is an American guitarist, singer, and songwriter of alternative country and pop music.  He was a founding member of the Minneapolis-based band the Jayhawks and their principal songwriter and vocalist after the departure of Mark Olson.  Louris is often credited with the band's subsequent move from folk-country toward a more progressive, pop sound. Windstorm is the fourth studio album released by Gloria Jones in 1978.  This album was a dedication to Marc Bolan, as on the rear cover, is written: "Special Dedication in memory of my son's father, the late Marc Bolan, whom we miss very much." Billy Super Duper is an album by English glam rock act T. Rex.  Released in 1982 by record label Marc on Wax, it was the first LP of entirely new and unheard material released after Marc Bolan's death in 1977 as the previous posthumous release, "You Scare Me to Death" consisted of demos first released in 1974.  Billy Super Duper consists of studio outtakes and home demos recorded by the band between 1972 and 1977, with arrangements produced by John and Shan Bramley (the heads of the Marc Bolan Fanclub at the time).  The album was intended to "complete" the demos and bring them up to date with contemporary music. Golden Smog is a loosely connected group of musicians comprising, at various times, members of Soul Asylum, The Replacements, Wilco, The Jayhawks, Run Westy Run, The Honeydogs and Big Star.  Golden Smog's lineup has often changed, but relative constants who appear on all the recordings are guitarists Kraig Johnson (Run Westy Run), Dan Murphy (Soul Asylum) and Gary Louris (The Jayhawks), along with bassist Marc Perlman (The Jayhawks). It<nowiki>'</nowiki>s About Time is a 2002 album by American rock guitarist and singer Marc Ford, former guitarist of The Black Crowes.  It was the debut solo album by Ford, and received good reviews.  Notable musicians who collaborated with Ford on this album include Ben Harper, Gary Louris (The Jayhawks), Warren Haynes, Allen Woody, Matt Abts (Gov't Mule) and Craig Ross (Lenny Kravitz).
Answer: Gary Louris