Information: - Progressive rock (shortened as "prog"; sometimes "art rock", "classical rock" or "symphonic rock") is a broad subgenre of rock music that developed in the United Kingdom and United States throughout the mid to late 1960s. Initially termed "progressive pop", the style was an outgrowth of psychedelic bands who abandoned standard pop traditions in favour of instrumentation and compositional techniques more frequently associated with jazz, folk or classical music. Additional elements contributed to its "progressive" label: lyrics were more poetic, technology was harnessed for new sounds, music approached the condition of "art", and the studio, rather than the stage, became the focus of musical activity, which often involved creating music for listening, not dancing. - "Free Four" is a song by the English rock band Pink Floyd, written by Roger Waters and released on the band's 1972 album "Obscured by Clouds". - Obscured by Clouds is the seventh studio album by the English progressive rock band Pink Floyd, based on their soundtrack for the French film "La Vallee", by Barbet Schroeder. Some copies of the album refer to the film by its English title, The Valley. The cover of "Obscured by Clouds" is an out-of-focus film still of a man in a tree. The lyrics and music tell the story of one's journeys. The album was released in the United Kingdom on 2 June 1972, and a few weeks later in the United States, by Harvest, reaching number 6 and number 46 respectively. A single, "Free Four", was issued in the US only. - A soundtrack, also written sound track, can be recorded music accompanying and synchronized to the images of a motion picture, book, television program or video game; a commercially released soundtrack album of music as featured in the soundtrack of a film or TV show; or the physical area of a film that contains the synchronized recorded sound. - '' Absolutely Curtains '' is a mostly instrumental track written by Richard Wright ( although it lists the whole band as writers on the Obscured by Clouds album ) , which closes Pink Floyd 's 1972 album Obscured by Clouds . - Psychedelic music (sometimes psychedelia) covers a range of popular music styles and genres influenced by the 1960s psychedelic culture, a subculture of people who used psychedelic drugs such as LSD, psilocybin mushrooms, mescaline and DMT to experience visual and auditory hallucinations, synesthesia and altered states of consciousness. Psychedelic music attempted to replicate the hallucinogenic experience of using these drugs or enhance the experience of using them. Psychedelic music emerged during the mid-1960s among folk rock and blues rock bands in the United States and Britain. - Pink Floyd were an English rock band formed in London. They achieved international acclaim with their progressive and psychedelic music. Distinguished by their use of philosophical lyrics, sonic experimentation, extended compositions and elaborate live shows, they are one of the most commercially successful and influential groups in the history of popular music. - Barbet Schroeder (born 26 August 1941) is an Iranian-born film director and producer who started his career in French cinema in the 1960s, working together with directors such as Jean-Luc Godard and Jacques Rivette. Since the 1990s he has directed many big budget Hollywood films in which he often combined family drama with thriller and action genre. Given the information, choose the subject and object entities that have the relation of 'instance of'.
The answer to this question is:
absolutely curtains , song