Seventies HairstylesThe Seventies are definitely coming back into fashion, with films such as Grease and Saturday Night Fever being re-released. Disco dancing is definitely becoming trendy again with lots of people taking classes in disco dancing. So, of course with this comes the seventies hairstyles and become fashionable again. Some of these hairstyles have of course become cult hairstyles. There is the seventies hairstyle of John Travolta in Grease, which consists of his black hair being combed back with gel, and the seventies hairstyle of Olivia Newton John.