So just to be clear, are we saying that a good comedy song is one that has no laughs in the verses, until the last one? That sounds more like a straight song that finishes on a laugh. The trouble is one joke songs don’t bearing hearing twice, whereas ones with some gentle laughs along the way, building up to a big finish, at least can be enjoyed a few times more. George Formby songs certainly had more than one gag in them, even if it was just comic wordplay and innuendo.