Swift's fourth studio album, Red, was released on October 22, 2012.[180] She wrote nine of the album's 16 songs alone, while the remaining seven were co-written with Rose, Max Martin, Dan Wilson, Ed Sheeran, and Gary Lightbody. Chapman served as the album's lead producer but Jeff Bhasker, Butch Walker, Jacknife Lee, Dann Huff and Shellback also produced individual tracks. Chapman said he encouraged Swift "to branch out and to test herself in other situations."[181] Musically, while there is experimentation with heartland rock, dubstep and dance-pop, it is "sprinkled among more recognisably Swiftian fare."[182][183]