Trilogy and "The Apu Trilogy" of films by Satyajit Ray. Others are connected only by theme: for example, each film of Krzysztof Kieślowski's "Three Colors" trilogy explores one of the political ideals of the French Republic (liberty, equality, fraternity). Trilogies can also be connected in less obvious ways, such as "The Nova Trilogy" of novels by William S. Burroughs, each written using cut-up technique. The term is less often applied to music, such as the "Berlin Trilogy" of David Bowie which is linked together by musical sound and lyrical themes, all having been recorded at least partly in Berlin, Germany. The
San Francisco in the 1970s as the San Francisco Sound was performed live and recorded by San Francisco-based rock groups of the mid-1960s to early 1970s. It was associated with the counterculture community in the city at the time. San Francisco was the cradle of the pornography industry in the United States in the 1970s, and led to a dramatic growth of strip clubs, adult movie theaters, "peep show" booths, and sex shops downtown, as well as to the creation of the first feminist advocacy groups for sex workers. Many skyscrapers were built in the city during this period. The city is also associated with