Conversation so far:
Was Dark Roots of Earth an album title by Testament?
On July 14, 2011, it was announced that the tenth Testament studio album would be called Dark Roots of Earth.
How many copies did Dark Roots of Earth by Testament sell?
By March 2013, Dark Roots of Earth sold around 60,000 copies in the U.S
What was one of the most famous hits on Dark Roots of Earth by Testament?
Native Blood was released as a single from the album on July 20, 2012, both as a download and a limited edition 7-inch single.

Question: Was there anyone else they made music with for this album?
Self-contained rewrite: Was there anyone else Testament made music with for the album Dark Roots of Earth?