Question: Which musican is part of the band Memphis May Fire, Matty Mullins or Steve Winwood?

full_context: Document 1: Stephen J. Lawrence: Stephen J. Lawrence (a.k.a. Stephen Lawrence) is an American composer, living and working in New York City. He has composed more than 300 songs and scores for "Sesame Street", resulting in three Emmy Awards for Outstanding Achievement in Music Direction and Composition; composed the title song and four others for Marlo Thomas's "Free to Be... You and Me", the landmark million-selling record, book and Emmy Award- and Peabody Award-winning ABC television special; composed the million-selling Gold Record "You Take My Breath Away"; scored the Robert De Niro movie "Bang the Drum Slowly" and the cult horror classic "Alice, Sweet Alice", which won the music award at the Paris International Festival of Fantasy and Science Fiction; composed score for "One Summer Love", 1976, a.k.a. "Dragonfly", composed the songs and score for the 1989 live-action movie musical "Red Riding Hood" starring Isabella Rossellini and Craig T. Nelson, lyrics by Michael Korie; composed songs for the live-action movie musical "The Emperor's New Clothes", starring Sid Caesar and Robert Morse; composed songs and score for "The Tale of Peter Rabbit", an HBO animated musical starring Carol Burnett, lyrics by Sheldon Harnick. He has a B.A. in music from Hofstra University. Married Christine Jones 1984. Daughter, Hannah Lawrence, born 1986. Married Cathy Schwartzman, 2002. Music Director, Temple Sinai, Stamford Ct, 2002 to 2012.
Document 2: Jonny Greenwood: Jonathan Richard Guy Greenwood (born 5 November 1971) is an English musician and the lead guitarist and keyboardist of the alternative rock band Radiohead. A multi-instrumentalist, Greenwood also plays instruments including the bass guitar, piano, viola, and drums, and is a prominent player of the ondes Martenot, an early electronic instrument. He works with electronic techniques such as programming, sampling and looping, and writes music software used by Radiohead. He described his role in the band as an arranger, helping to transform singer Thom Yorke's demos into full songs. He has been named one of the greatest guitarists of all time by publications including the "NME," "Rolling Stone" and "Spin".
Document 3: Memphis May Fire (EP): Memphis May Fire is the self-titled first release by metalcore band Memphis May Fire. It was released on December 4, 2007 through Trustkill Records. This EP was the only official release by Memphis May Fire to feature Chase Ryan, the former vocalist who left the band in 2008 to focus on his newborn child. Guitarist Kellen McGregor described Ryan's contributions to "Rock Sound", "Chase writes about dreams that make absolutely no sense. We're not a really serious band and that part is reflected in Chase's lyrics."
Document 4: Matty Mullins (album): Matty Mullins is the first full-length album by American rock musician Matty Mullins which was released September 23, 2014 by Rise Records.
Document 5: Sleepwalking (Memphis May Fire album): Sleepwalking is the debut full-length studio album by American metalcore band Memphis May Fire. The album was released through Trustkill Records on July 21, 2009. This album is the first album to feature lead vocalist Matty Mullins after former lead vocalist Chase Ryan left the band in 2008. Scheduled to be released summer 2008, the release got delayed because of the line-up change. Mullins has described the album as "a new breed of rock 'n' roll" and musically it has "more aggressive guitar work and noticeably more melodic, but still retains that southern swagger."
Document 6: Revolutions – The Very Best of Steve Winwood: Revolutions – The Very Best of Steve Winwood is the sixth compilation album by Steve Winwood. The album includes music from Winwood's solo career, as well as groups with which he has performed, including The Spencer Davis Group, Traffic, and Blind Faith. The CD was released as a box set and a single disc. As of October 2014, the box set is out of print (but can be purchased digitally), while the single disc is still available. The songs "The Finer Things" and "Roll With It" are exclusive to the single disc version and cannot be found on the box set.
Document 7: Matthew Tuck: Matthew "Matt" Tuck (born 20 January 1980) is a Welsh musician. He is the lead vocalist and rhythm guitarist in the Welsh heavy metal band Bullet for My Valentine. He and the other 3 members of his old band founded "Jeff Killed John" in 1998, but after bassist Nick Crandle left in 2003, the band was renamed to Bullet for My Valentine. He is also a singer and guitarist in the supergroup AxeWound, which was formed in 2012. He also plays piano, drums, keyboard, and harmonica. He did a collaboration with Max Cavalera (Soulfly, Cavalera Conspiracy, ex-Sepultura) and with Apocalyptica in the song "Repressed".
Document 8: Roy Wood: Roy Wood (born 8 November 1947) is an English singer-songwriter and multi-instrumentalist. He was particularly successful in the 1960s and 1970s as member and co-founder of the Move, Electric Light Orchestra and Wizzard. As a songwriter, he contributed a number of hits to the repertoire of these bands.
Document 9: Matt Willis: Mathew James "Matt" Willis (born 8 May 1983), also previously known as Mattie Jay, is an English singer-songwriter, television presenter and actor, best known as the bassist and one of the vocalists of the pop punk band, Busted. Willis released his debut solo album "Don't Let It Go to Waste" on 20 November 2006, which included three top 20 singles.
Document 10: Steve Tibbetts: Tibbetts plays acoustic and electric guitar as well as exotic percussive instruments such as the kendang and kalimba. His musical compositions span several genres and styles including experimental, jazz, rock, ambient, and world music. He has self described his music as "post modern neo-primitivism". Often more than one genre or style is found in a single composition. A variety of techniques may be used with the guitar such as a string-bending technique sonically imitating a sarangi with a 12-string guitar while also alternating between ambient soundscape and Hendrix-like distorted and feedbacked leads with an electric guitar. He incorporates field-recordings such as the footsteps in the track "Running" from "Safe Journey", or the chanting of Nepalese villagers from the last tracks of "Big Map Idea". Tibbetts' recordings often include percussion by St Paul's Marc Anderson.
Document 11: M. Shadows: Matthew Charles Sanders (born July 31, 1981), better known as M. Shadows, is an American singer, songwriter, and musician. He is best known as the lead vocalist, songwriter, and a founding member of the American heavy metal band Avenged Sevenfold. In 2017, he was voted 3rd in the list of Top 25 Greatest Modern Frontmen by Ultimate Guitar.
Document 12: Matty Mullins: Matty Mullins (born July 3, 1988) is an American rock musician. He is the lead vocalist of Dallas-based metalcore band Memphis May Fire.
Document 13: Ron Stewart (bluegrass): Ron Stewart is an American multi-instrumentalist in the bluegrass tradition. He plays fiddle, guitar, banjo, and mandolin, and has won the International Bluegrass Music Association (IBMA) award for Fiddle Player of the Year in 2000 and Banjo Player of the Year in 2011.
Document 14: Steve Winwood: Stephen Lawrence "Steve" Winwood (born 12 May 1948) is an English musician whose genres include rock, blue-eyed soul, rhythm and blues, blues rock, pop rock, and jazz. Though primarily a vocalist and keyboardist, Winwood also plays bass guitar, drums, acoustic and electric guitar, mandolin, violin, and other strings.
Document 15: Mike Mattison: Mike Mattison is an American musician and vocalist of the Grammy Award-winning blues rock/soul group, the Tedeschi Trucks Band, as well as lead vocalist and co-founder of the blues rock trio Scrapomatic. Mattison's vocal sound has been described as "strong," with an "expressive blues voice". As lead vocalist of Scrapomatic, he picked up a nomination for Minnesota Music Awards best male vocalist, and both he and co-founder Paul Olsen were also nominated for best R&B Group. Mattison was previously the lead vocalist of the Grammy Award winning Derek Trucks Band and has been a main songwriter of all three bands. He is also an active essayist who publishes on music and poetry. Since 2013 Mattison and Ernest Suarez have edited “Hot Rocks: Songs and Verse,” an ongoing feature in Five Points: A Journal of Literature and Art.
ground_truth: Matty Mullins