Pop music sampling (from the 1980s) have also been utilized as methods for the creation and elaboration of pop music. By the early 1980s, the promotion of pop music had been greatly affected by the rise of music television channels like MTV, which "favoured those artists such as Michael Jackson and Madonna who had a strong visual appeal". The latter half of the 20th-century included a large-scale trend in American culture in which the boundaries between art and pop music were increasingly blurred. Between 1950 and 1970, there was a debate of pop versus art. Since then, certain music publications have embraced
World music outlined by corporate marketing forums and music journalism. The world music genre's gradual migration from a clear spectrum of roots music traditions to an extended list of hybrid subgenres is a good example of the motion genre boundaries can exhibit in a globalizing pop culture. The classic, original definition of world music was in part created to instill a perceived authenticity and distinction between indigenous music traditions and those that eventually become diluted by pop culture, and the modern debate over how possible it is to maintain that perception in the richly diverse genre of world music is ongoing. In