Muppet Wiki recently uploaded this clip on both Facebook and Twitter (though the beginning is cut in the Twitter upload):
I think this is the first time Hardhead Henry Harris has a lot of dialogue, and the only pre-season six one (that I know of) where he does have a lot of dialogue. And he does sound a lot different here than in other segments. In Sesame Street Unpaved it says that Roscoe Orman did the voice, which most likely wasn't the case with the seasons 4-5 segments (and his dialogue in those were very brief - I wondered if he was just a random AM used in those segments at first). In the last year, I've seen that the Muppet Wiki page for Hardhead Henry Harries lists his performer as "unknown" while also noting Orman did the voice in one of the albums. Maybe Sesame Street Unpaved only noted Orman as the voice based on the album experience, his regular voice doesn't sound like Roscoe Orman. But here, his voice sounds very different, and while I can't pinpoint who it is, the voice does sound very familiar. Like something I've heard on Sesame Street.
Also interesting how the students are all mad at Roosevelt Franklin for referring to himself as the other great person, when he had pointed out there's two more great people they hadn't named. I don't see how referring to himself as great was different from telling all of them that they are great.
The lesson is about pride and acceptance, but it also seems like a lesson could be that everyone is great, not just celebrities. All the people they mention (in addition to Smart Tina's dentist) are famous people, before Roosevelt tells them that they are all great as well.