Ambient music has strong roots in pre-electronic music times with early influences from Modernist and Minimalists classical composers. It started to take shape as a genre in the late 1970's but really accelerated in the mid to late 1980's with the emergence of synthesized and electronic music. Throughout the 1990's and 2000's ambient split evolved into and heavily influenced distinct genres such as Chill Out and Trip Hop. This process also saw a 'purification' of Ambient as a genre and the emergence of sub genres such as Pure Minimal.