is he part of a band?
Yes, he is part of the rock band U2
The Edge
 backing vocalist of the rock band U2
what was u2 song sunday bloody sunday about The 1972 Bloody Sunday incident in Derry where British troops shot and killed unarmed civil rights protesters. who wrote it? The Edge whos is this? David Howell Evans
wiki:18760612
The Edge [SEP] Introduction
David Howell Evans (born 8 August 1961), better known by his stage name the Edge (or simply Edge), is a British-born Irish musician and songwriter best known as the lead guitarist, keyboardist, and backing vocalist of the rock band U2. A member of the group since its inception, he has recorded 14 studio albums with them as well as one solo record. The Edge's understated style of guitar playing, a signature of U2's music, is distinguished by chiming timbres, use of rhythmic delay, drone notes, harmonics, and an extensive use of effects units. The Edge was born in England to a Welsh family, and was raised in Ireland after the Evans family moved there.