Like Corman's "Teenage Doll," "Sorority Girl" and several others of his AIP era, this is basically a bleak little existential melodrama masquerading as a lurid exploitation movie, with talky, unpleasant human relationships in a couple cheap interior settings poorly disguising the lack of action and "fun." Only those other movies were often conceptually outlandish (and stylish) enough to be sorta fascinating in their perversity.
"Rock All Night" front-loads a couple songs by The Platters, but otherwise it's just two long scenes of people arguing in bars--first comically (at a nightclub), then dramatically (at a dive). At around the two-thirds point all this yakking gets more heated as the story turns into "The Petrified Forest," with everybody being held hostage by a couple fugitive hoods (including, yes, The Professor from "Gilligan's Island").
Dick Miller gets to play his usual wiseguy, albeit a heroic one this time, and future game show regular Abby Dalton plays a bad amateur singer who inexplicably is given more airtime than any other act here. The combination of Corman, early rock and AIP should provide plenty of guilty pleasure, at the very least. But "Rock All Night" is really just pretty dull--and in a way that's primarily like a weak one-act off-Broadway play of the time, with lots of generic angst and generically lowlife characters yelling at each other. In other words, as the Mel Welles quasi-beatnik character might say, yawnsville.