There was great rock music that was also popular in the 60s and 70s, but it was not popular because it was great. The Beatles wrote some great songs, and they were popular because they were given cute personalities and ran from one limo to the next. Elvis Presley wrote some great songs, and he was popular because he shook his ass around.
Gotta disagree. Elvis is one of the founding fathers of Rock and Roll. The Beatles are the founding fathers of Rock. Many, if not all, of the Rock acts that followed probably wouldn't be here with out them. The Beatles might have started as teen heart throbs with "cute personalities" but they rapidly evolved beyond that.