The "Monster Mash" is a 1962 novelty song written by Leonard Capizzi and Bobby Pickett, members of a band called The Cordials. It was written after Capizzi, impressed by Pickett's ability to impersonate famed horror actor Boris Karloff, suggested that the band make use of his impression.
Taking only a half hour to write, "Monster Mash" became a huge hit upon release, reaching number one on the Billboard charts for two weeks in 1962. According to Billboard.com, the song owed much of its success to two pop cultural trends at the time. The first trend was the movie monster craze, created when Universal Studio's monster films from the 1930s and 1940s began airing in syndication in 1957 on "Shock Theater." The second trend that helped make Monster Mash a hit was the dance craze, which was kicked off by Chubby Checker's 1960 hit, "The Twist."
Although the monster movie and dance fad eventually died out, "Monster Mash" continued its popularity over the years, even going so far as make the top 10 of the Billboard charts again in 1973.