The final product, her fifth album "Back to Basics", comprises two discs. For the first half disc, Aguilera collaborated with "more beat-driven" producers including DJ Premier and Mark Ronson, who incorporated musical samples into many of the recordings. She described it as "kind of a throwback with elements of jazz, blues and soul music combined with a modern-day twist, like hard-hitting beats". The contents of the second disc were written and produced solely by Linda Perry, Aguilera's longtime collaborator. Aguilera had first collaborated with DJ Premier after hearing his jazz-influenced work with Gang Starr. She revealed that she was impressed, and she also wanted to make jazz-influenced materials. Aguilera stated that she was unsure if DJ Premier would accept the offer, having been his first time working with pop music. Premier later agreed and commented,