Because of the cover of the audio, I can infer that George Carlin is a comedian and I looked it up to make sure too. Comedians tend to engage with the audience, to capture their attention or else well they wouldn’t have an audience. His tone in voice changes throughout the audio, it ranges from high to low tones which keeps the audience on their toes as they saying goes. Also, Carlin changes speed, from when he’s saying the 7 words very quickly to explaining some usage to the words slowly. He incorporates jokes that tie in the 7 words, again using humor to engage the audience while since getting the point across.
