Information:  - Music is an art form and cultural activity whose medium is sound and silence, which exist in time. The common elements of music are pitch (which governs melody and harmony), rhythm (and its associated concepts tempo, meter, and articulation), dynamics (loudness and softness), and the sonic qualities of timbre and texture (which are sometimes termed the "color" of a musical sound). Different styles or types of music may emphasize, de-emphasize or omit some of these elements. Music is performed with a vast range of instruments and vocal techniques ranging from singing to rapping; there are solely instrumental pieces, solely vocal pieces (such as songs without instrumental accompaniment) and pieces that combine singing and instruments. The word derives from Greek  ("mousike"; "art of the Muses"). In its most general form, the activities describing music as an art form include the production of works of music (songs, tunes, symphonies, and so on), the criticism of music, the study of the history of music, and the aesthetic examination of music. Ancient Greek and Indian philosophers defined music as tones ordered horizontally as melodies and vertically as harmonies. Common sayings such as "the harmony of the spheres" and "it is music to my ears" point to the notion that music is often ordered and pleasant to listen to. However, 20th-century composer John Cage thought that any sound can be music, saying, for example, "There is no noise, only sound."  - Michael Henry Flanders OBE (1 March 1922  14 April 1975) was an English actor, broadcaster, and writer and performer of comic songs. He is best known for his stage partnership with Donald Swann.  - Flanders and Swann were a British comedy duo. The actor and singer Michael Flanders (19221975) and the composer, pianist and lyricist Donald Swann (19231994) collaborated in writing and performing comic songs. They first worked together at a school revue in 1939 and eventually wrote over a hundred comic songs together.  - At the Drop of a Hat is a musical revue by Flanders and Swann, described by them as "an after-dinner farrago". In the show, they both sang on a nearly bare stage, accompanied by Swann on the piano. The songs were linked by contemporary social commentary, mostly by Flanders. After a long London run the show played in the US, Switzerland, and on tour in Britain.  - At the Drop of Another Hat is musical revue by Flanders and Swann , similar in format to its long - running predecessor , At the Drop of a Hat ( 1956 ) . In the show , they both sang on a nearly bare stage , accompanied by Swann on the piano . The songs were linked by contemporary social commentary , mostly by Flanders . Highlights included `` Ill Wind '' , in which Flanders sings rapidly about a pilfered horn to the tune of the Rondo from Mozart 's Horn Concerto No. 4 and `` New Built Up Area '' , a soliloquy by Flanders in which a disgruntled resident of Salisbury Plain complains of the newly erected Stonehenge . The revue premiered at the Haymarket Theatre in London on 2 October 1963 and ran until 21 March 1964 . It was revived on the West End , at the Globe Theatre , from 29 September 1965 to 19 February 1966 . The show toured widely , including tours in Australia ( 1964 ) , Hong Kong and England ( 1965 ) and in 1966 Canada and the US . A Broadway production played at the Booth Theatre from 31 December 1966 to 9 April 1967 .  - A revue (from French 'magazine' or 'overview') is a type of multi-act popular theatrical entertainment that combines music, dance and sketches. The revue has its roots in 19th century popular entertainment and melodrama but grew into a substantial cultural presence of its own during its golden years from 1916 to 1932. Though most famous for their visual spectacle, revues frequently satirized contemporary figures, news or literature. Similar to the related subforms of operetta and musical theatre, the revue art form brings together music, dance and sketches to create a compelling show. In contrast to these, however, revue does not have an overarching storyline. Rather, a general theme serves as the motto for a loosely-related series of acts that alternate between solo performances and dance ensembles.    After reading the paragraphs above, we are interested in knowing the entity with which 'at the drop of another hat' exhibits the relationship of 'composer'. Find the answer from the choices below.  Choices: - donald swann  - john cage
donald swann