This is actually strictly dialogue between Barry and his grandfather, Joe, made circa 1951 or right around that time They were at a "Record Your Own Voice" booth, and this is approximately how the conversation went

JOE: All right! "A Happy Birthday", come on, go ahead, sing
BARRY: What? What?
JOE: Sing I have the words for you, sing it Sing it Sing to me! "A happy birthday to you"¦"
BARRY: N-no, I can't! I have to go to the bathroom
JOE: All right, go ahead, Barry, sing it, sing it! Sing it! Go ahead
BARRY: When?
JOE: I said now Go ahead, sing it "Happy"¦" Go ahead, come on Come on, sing it! Come on, go ahead
BARRY: How?
JOE: Like this, "Happy"¦" Come on, go ahead All right, my dear grandson, "A Happy Birthday" Barry's gonna sing to you a nice song Go ahead, Barry, sing it! Go ahead, sing it! Come on"¦come on, Barry, sing it! Sing "A Happy Birthday" Barry, don't you want to sing it? Come on, Barry, sing it"¦Well, I'm sorry, my dear grandson, Barry, don't want to sing for you OK, what do you want to sing? Do you want to sing a rhumba? All right, sing the rhumba Go ahead, Barry, sing it! Go ahead, Barry, sing it! Go ahead, Barry Come on, sing it Come on, Barry! You gotta talk to make a record Don't you want to make a record? Don't you want to make a record? You want to make a record, Barry? Huh? Go ahead!