Hardcore Punk was the most rigid and extreme variation of punk rock. Emerging in the early '80s, hardcore took the ideals of punk as far as it could go. The music was impossibly fast, the vocals were shouted, the riffs were simple, and the records looked (and sounded) like they were made in someone's basement. Most of the bands sounded incredibly similar to each other, but there was a handful of distinctive bands; they usually developed musically quite quickly, leaving the sound of hardcore behind, but not its ideals. Hardcore punk was primarily an American sensation and was concentrated in Los Angeles and New York, but there were small, individual scenes scattered across the country.