(SOUNDBITE OF SONG "BABY")
OPHIRA EISENBERG, HOST:
Jonathan, are you hearing this?
JONATHAN COULTON: Oh yeah, can you hear it too?
EISENBERG: Yeah, I know.
COULTON: 'Cause I just have it playing in my head all the time, it's Justin Bieber.
EISENBERG: Oh, you do. Yeah, yeah, it is Justin Bieber.
COULTON: Oh no, no, wait a second. If Justin Bieber's our mystery guest, you know, my daughter is never going to forgive me for not letting her come to the show.