Question: What role have both Matthew Tuck and Frank Iero performed in musical groups?

Context paragraphs:
Drive By (band): Drive By was a New Jersey based music group that has been touring nationally and internationally since 2004 after the release of their debut album I Hate Every Day Without You Kid... After three years of touring in support of the album, they released a new record, title A Delicate Situation, on April 8, 2008.  "Delicate Situation" reached #26 on the Billboard" Heatseekers chart.  Lead Singer/Guitar player Todd Price has covered for Frank Iero of My Chemical Romance on several tours.  The band is signed to Riot Squad Records and Riot Squad Management, a management company that also works with My Chemical Romance, Circa Survive, Endless Hallway and Fever Club.

My Chemical Romance: My Chemical Romance (often abbreviated as MCR) was an American rock band from Newark, New Jersey, active from 2001 to 2013.  The band's best-known lineup consisted of lead vocalist Gerard Way, guitarists Ray Toro and Frank Iero, bassist Mikey Way and drummer Bob Bryar.  Founded by Gerard, Mikey, Toro, Matt Pelissier, and later joined by Iero, the band signed to Eyeball Records and released their debut album "I Brought You My Bullets, You Brought Me Your Love" in 2002.  They signed with Reprise Records the next year and released their major label debut "Three Cheers for Sweet Revenge" in 2004.  Shortly after the album's release, Pelissier was replaced by Bob Bryar.  A commercial success, the album was awarded platinum status over a year later.

Frank Iero: Frank Anthony Iero, Jr. (born October 31, 1981) is an American musician who was the rhythm guitarist and backup vocalist of the rock band My Chemical Romance and post-hardcore band Leathermouth.  He has a solo punk rock project titled Frank Iero and the Patience.  He released an album under the previous name of frnkiero andthe cellabration titled "Stomachaches" which was released on August 26, 2014.  The first single off the album, called "Weighted", premiered on BBC Radio One on July 8, 2014.

Death Spells: Death Spells is an American digital hardcore band formed in 2012.  The group is composed of former My Chemical Romance rhythm guitarist Frank Iero and keyboardist James Dewees (also of The Get Up Kids and Reggie and the Full Effect), who were both members of hardcore punk band Leathermouth as well.

List of songs recorded by My Chemical Romance: The following is a list of recorded songs by the American alternative rock/punk band My Chemical Romance.  A song titled "Hell Hath No Fury" was recorded for The Man with the Iron Fists but was never released.  An instrumental of the track credited to Gerard Way, Mikey Way, Frank Iero, Ray Toro and James Dewees appears in the movie.

Frank Iero and the Patience: Frank Iero and the Patience is an American rock band from Belleville, New Jersey.  Their debut album, "Stomachaches", was released on August 25, 2014.  Their second album "Parachutes" was released on October 27, 2016 with the promotional singles "I'm A Mess", "Remedy", and "Oceans".  Their current lineup consists of Frank Iero, Evan Nestor, Matt Olsson, and Alex Grippo.  Steve Evetts is credited with writing and recording the bass tracks on "Parachutes".

Parachutes (Frank Iero and the Patience album): Parachutes is the second album by guitarist and singer-songwriter Frank Iero and the follow up to 2014's "Stomachaches".  It was released on October 28, 2016 via Vagrant Records with exclusive license to Hassle Records for the UK release.

Leathermouth: Leathermouth (often typeset as LeATHERMØUTH) was an American hardcore punk band led by Frank Iero.  The band formed in 2007, and in January 2009 released their first album "XO".

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".

XO (Leathermouth album): XO (often typeset as XØ) is the debut album released by Leathermouth, My Chemical Romance's rhythm guitarist Frank Iero's hardcore punk side project.  Although the album did not chart on the "Billboard" 200, it did reach No. 21 on the Top Heatseekers chart.

Supporting paragraphs: Matthew Tuck Frank Iero
Answer: rhythm guitarist