Twisted Sister are a heavy metal band formed in New York in 1972. They had an extended hiatus between 1988 and 1997 before regrouping with a new line-up. They are still going.
Their sound and look fuses elements of early 1970s Glam punk (as opposed to Glam rock) a la New York Dolls, with the aggression of British heavy metal of the same period (e.g. Judas Priest, Black Sabbath).