I know, I know-- "The Zombies? They're pop! They're just Beach Boys-influenced baroque pop that--" STOP. Baroque-pop, in this case, indicates a mixture of pop and classical, an ideal of progressive rock. Now, I'd like you to go listen to "Hung Up On A Dream" once or twice and tell me that's not one of the best syntheses of classical and rock you've heard--as well as an incredible showcase for the beloved Mellotron. Their follow-up band, Argent, is in the Prog Archives listings, and if such bands as Procol Harum, (a major influence) or ESPECIALLY The Moody Blues are here, perhaps so should the Zombies.
But they're no priority.