Dublin Death Patrol

Dublin Death Patrol (DDP) is an American thrash metal band formed in 2006 by Testament singer Chuck Billy and former Legacy and Exodus singer Steve Souza.
The band began as a 7 piece with Souza and Chuck Billy on vocals, Chuck's brother Andy Billy, Greg Bustamante, and Steve Robello on guitar, Willy Lange on bass, and Dan Cunningham on drums. During the recording process of the album in 2007 the band added 3 more members to the fold, Troy Luccketta on drums/percussion, Steve Souza's brother John Souza on bass, and Phil Demmel on guitar. They made one more change after the album adding their 11th member, Eddie Billy on bass- the third of the Billy brothers in the band.

Testament

Testament is an American thrash metal band from Berkeley, California, formed in 1983. They are often credited as one of the most popular bands of the 1980s thrash metal scene. In the 29 years since its inception, Testament has had numerous lineup changes, and guitarist Eric Peterson has been the only constant member, although the band currently also features two of its original members, Alex Skolnick (guitarist) and Greg Christian (bass). Chuck Billy replaced former singer Steve Souza in 1986, prior to the recording of their first studio album, The Legacy, and has been a member of the band since.