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

Context paragraphs:
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.

This Light I Hold: This Light I Hold is the fifth studio album by metalcore band Memphis May Fire.  It was released on the October 28, 2016 by Rise Records.  The album debuted at number 42 on the Billboard 200 chart.

Challenger (Memphis May Fire album): Challenger is the third full-length album by American metalcore band Memphis May Fire which was released June 26, 2012 via Rise Records.  The band released the first single, "Prove Me Right," on May 24.  They also released the 5th track on the album, "Vices," on June 13 as the second single from the album.  On June 18, all of the songs were uploaded to YouTube on the Rise Records page.

Rise Up Tour: The Rise Up Tour is a concert tour co-headlined by American metalcore band The Devil Wears Prada and American metalcore band Memphis May Fire.  The tour supports The Devil Wears Prada's Sixth studio album, "Transit Blues" and Memphis May Fire's fifth studio album, "This Light I Hold".  The second leg in Europe added Canadian post-hardcore band Silverstein as a third headliner supporting their eighth studio album "I Am Alive in Everything I Touch.

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.

The Hollow (album): The Hollow is the second studio album by the metalcore band Memphis May Fire.  It was released on April 26, 2011, through Rise Records.  The album is the band's first release on the label.

Feel (Sleeping with Sirens album): Feel is the third album by American post-hardcore band Sleeping with Sirens was released by June 4, 2013.  This is the last album released on Rise.  The first single, "Low", was released on April 23, 2013.  The second single, "Alone", featuring rapper MGK, was released on May 21, 2013.  The album also features guest appearances by Fronz (Attila), Matty Mullins (Memphis May Fire) and Shayley Bourget (Dayshell, ex-Of Mice & Men).  The entire album was produced by Cameron Mizell who had produced their debut album.  On May 26, 2013 the entire album was streamed on the Rise Records YouTube channel.

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."

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.

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."

Supporting paragraphs: Matty Mullins Steve Winwood
Answer: Matty Mullins