Pop music hits on the generations has truly changed immensely and no more so than in the last 5 years. Throughout the evolution of popular music before the last Two decades pop music usually encompassed only 1 genre of music. Consider Baroque, Renaissance, and Classical music. The music activity was by different composers but stayed well within the same kind of musical category. When recorded music came to the scene and commenced being broadcasted over radio waves the transmission of pop music hits became different however, not it overall mandate which was that it still retained its origin in a single type of music.
Think about the advent of jazz was developed part of the Last century. Jazz was prevalent for some time as the main type of pop music. What you heard could have a jazz feel into it. We're talking pop jazz here not the blues, the blues although popular amongst musicians themselves were more of an influential genre when compared to a popular one. Then obviously there was rock and roll which really dominated the pop music hit culture before the advent of Motown and R&B music.
Rock and roll and R&B dominated pop music until Disco arrived and then to a small extent country music gained some popularity being a main stream genre. The 70's was a mixed bag of rock, R&B, ballads and country music, mixed in after a little kitsch. Remember, CW McCall? Rock and R&B still dominated though showing its resilience right until the late 1980's when Rap came onto the scene. A combination of pop music hits started to change somewhat. Rock and roll was being knocked out a little by Rap and R&B and was no longer the dominant force in pop.
Today, pop music hits is now an amalgamation of all of the music genres. You will have a country song, R&B song, and Rap songs all on a single pop chart. Indeed, even stereo have changed around their formats to become more ubiquitous and fewer focused on only 1 kind of music. The influences are all still there because of rock and roll nevertheless the cadence and tunes themselves have changed and transmogrified into the mix of Eryn Young Merchandise we've adopted within the last five years. Like everything pop music has progressed and expanded exponentially nowadays most of which has occurred just during the last five years.