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 Haight and fixing them up. When drugs and violence began to become a serious problem in the Haight, some gay people simply moved "over the hill" to the Castro replacing Irish-Americans who had moved to the more affluent and culturally homogeneous suburbs. The Castro became known as a Gay Mecca, and its gay population, particularly men, swelled as significant numbers of gay people moved to San Francisco in the 1970s and 1980s. The growth of the gay population caused tensions with some of the established ethnic groups in the southern part of the city. The music scene, especially jazz fusion,