Conversation so far:
What hit songs are on Nickelback's albums?
Nickelback's song How You Remind Me was listed as the best-selling rock song and the fourth best-selling song of the decade overall.
Did Nickelback receive good reviews for their albums?
Metacritic reports that five of Nickelback's six most recent studio albums have scores of 62, 41, 49, 51, and 54, respectively, out of 100, indicating generally mixed reviews.
Did Nickelback have any other major hits on the Darkhorese album?
Gotta Be Somebody became Nickelback's 5th and so far final single to hit the #1 spot on the U.S. Adult Top 40 chart.
How did Nickelback's Darkhorse album do on the charts?
All eight singles off of Nickelback's Darkhorse were major hits which finished at or near the top of at least one high-profile chart.

Question: Who produced for them?
Self-contained rewrite: Who produced for Nickelback?