 Complete the following phrase:  Animals is both a progressive rock album and a concept album, focusing on the social-political conditions of mid-1970s Britain, and was a change from the style of their earlier work. Tension within the band during production culminated in keyboardist Richard Wright being fired two years later. The albums cover shows an inflatable pig floating between two chimneys of Battersea Power Station, conceived by the bands bassist and lead songwriter Roger Waters, and was designed by long-time collaborator Storm Thorgerson. The band released no singles from the record, but promoted it through the 