Hundreds of pamphlets, broadsides, chapbooks and other street literature about murders and other crimes were published from 1550 to 1700 in Britain as literacy increased and cheap new printing methods became widespread. They varied in style: some were sensational, while others conveyed a moral message. Most were purchased by the "artisan class and above", as the lower classes did not have the money or time read them. Ballads were also created, the verses of which were posted on walls around towns, that were told from the perpetrator's point of view in an attempt to understand the psychological motivations of the crime. Such pamphlets remained in circulation in the 19th century in Britain and the United States, even after widespread crime journalism was introduced via the penny press.