Why do you call them both Johns? Is that a Beatles fan inside joke?
Because they are both named ... John?
Paul's name is James, actually.
"The Two Johns" is usually used for the band They Might Be Giants, who are John Linnell and John Flansburgh (plus a technically rotating backup band, but usually Danny Weiskopf, Dan Miller and Marty Beller).
Hah no, I honestly have no idea why I wrote that accidently. Maybe as someone mentioned I was thinking of TMBGs or something.