I contend that The Beatles created or popularized pop rock. Before them popular music was basically pop music, but you could say some like Elvis Presley were rock (some of his songs). The Beatles mixed more of rock into their pop although their songs ranged from almost pure rock to almost pure pop. What is popular today would not be considered pop rock to people like me who grew up in the 60s and 70s. There is very little rock in popular music today.