A Great Guy lyrics

Howard: Well, the character I play is a great guy, you see, right away that gives me a start. Uh, on the other hand, half of it's reality and half of it isn't, you know? Where the line is, it's sometimes even hard for the players to tell, you know. It's just, uh, when you look at your script some lines come easier than other lines, you know, and usually those are the ones that you've said before, but feel that you could say quite honestly, you know, and some other things were made up and it, it comes out that way

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What do you think is the meaning of A Great Guy by Frank Zappa?