What are the 25 best rock + metal collaborations of the '90s and 2000s? READ MORE: Do You Remember These Forgotten 2000s Rock Supergroups? So join us as we look at the best rock and metal collaborations of the 1990s and 2000s below. 10 Best 1990s Rock + Metal Collaborations Two name artists, one great pairing. Gallery Credit: Chad Childers, Loudwire15 Best Rock Collaborations of the 2000s The collaborative spirit was alive and well in the 2000s Gallery Credit: Chad Childers, LoudwireSubscribe to Loudwire on YouTube!