What role have both Matthew Tuck and Frank Iero performed in musical groups?
Matthew Tuck:  He is the lead vocalist and rhythm guitarist in the Welsh heavy metal band Bullet for My Valentine. 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.
rhythm guitarist