Atomic Rooster was a British prog-rock band best known to me for their swell name and the fact that Carl Palmer was their first drummer. Atomic Rooster also had some terrific roostery album covers beginning with their debut album. Here’s a sampler beginning with their 1970 eponymous LP featuring a mutant rooster:

Not all their album covers featured roosters but those are the ones I like the best. Next up are covers from two compilations, which are cockier than hell, which rhymes with cockrell:

Ready for some mutant rooster music? Here’s Atomic Rooster’s debut album in its entirety: