Minimalist music is an originally American genre of experimental or Downtown music named in the 1960s based mostly in consonant harmony, steady pulse (if not immobile drones), stasis and slow transformation, and often reiteration of musical phrases or smaller units such as figures, motifs, and cells. Starting in the early 1960s as a scruffy underground scene in San Francisco alternative spaces and New York lofts, minimalism spread to become the most popular experimental music style of the late 20th century. The movement originally involved dozens of composers, although only four - Terry Riley, Steve Reich, Philip Glass, and, less visibly if