In an era when Clear Channel-owned stations play the same 30 corporate-approved pop hits over and over in a never-ending loop, it seems impossible to believe there was ever a place in radio for DJs like Pittsburgh icon Mad Mike Metrovich. Guys like Metrovich were the motor-mouthed heralds of a new teen culture, larger-than-life tastemakers and soothsayers whose quirks and sensibilities profoundly shaped the musical landscape as far as the station signal carried. Mad Mike was a particularly compelling character by any metric, with his WZUM show virtually ignoring the British Invasion in favor of local hits, rockabilly classics, and R&B scorchers that championed a raw, dynamic sound presaging the emerging garage rock scene. (Further bolstering his anti-authoritarian stance, Metrovich steadfastly refused to identify the records he spun either on the air or at live gigs, creating even more rabid listener interest in his playlists.) The second volume in Norton Records' Mad Mike Monsters series assembles more than a dozen staples from Metrovich's 1964-1967 heyday, bolstered by WZUM radio spots and other vintage ephemera -- highlights include the Del-Mars' "Snacky Poo," the Marquis Chimps' "Red Rose Tea," the Renegades' "Geronimo," and the Grand Prees' "Jungle Fever."