Note: This is just my theory about the whole conversation between Marvin and his cousin Chuck. Based partly on what I now know about the history of Rock and Roll. Enjoy.
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Chuck: Hello?
Marvin: Chuck! Chuck, it's Marvin.
Chuck: Who?
Marvin: Your cousin, Marvin Berry.
Chuck: Oh, it's been awhile.
Marvin: You know that new sound you been looking for? Well listen to this.
Chuck: That's my song.
Marvin: What?
Chuck: I haven't even recorded it yet and already a white boy stole it. How the hell did that happen?
Marvin: I don't know, I didn't even know you wrote this.
Chuck: I gotta record this, soon. Hell if I'm letting this guy steal my work.
Marvin: I'll have a word with this guy.
Chuck: Don't. I've bene to prison, I don't recommend it. Do they like it.
Marvin: The audience loves it, except for this last guitar solo.
Chuck: Good to know he can't do it as well as me.