Roots of Mariusz Duda

Testament is an American thrash metal band from Berkeley, California. Formed in 1983 under the name Legacy, the band's current lineup includes rhythm guitarist Eric Peterson, lead vocalist Chuck Billy, lead guitarist Alex Skolnick, bassist Steve Di Giorgio and drummer Chris Dovas. Testament has experienced many lineup changes over the years, with Peterson being the only remaining original member. The band has released fourteen studio albums, four live albums, five compilation albums, thirteen singles and three DVDs. They are estimated to have sold over 1.4 million albums in the United States since the beginning of the SoundScan era, and over 14 million copies worldwide as of 2016.

Flotsam and Jetsam is an American thrash metal band that was formed in Phoenix, Arizona, in 1981. Before settling on its name in 1984, the band was known as Paradox, Dredlox and The Dogz. Their latest lineup includes vocalist Eric "A.K" Knutson, guitarists Michael Gilbert and Steve Conley, bassist Bill Bodily, and drummer Ken Mary. Flotsam and Jetsam went through several lineup changes over the years, leaving Knutson as the only constant member. They featured a then-unknown Jason Newsted as their bassist from 1981 to 1986, when he left the band shortly after the release of their debut album to join Metallica.