Calypso (music), form of folk music developed in Trinidad, West Indies, and originally sung at carnivals. Frequently improvised, the words of calypso songs usually concern topical or satirical themes, and they are characterized technically by arbitrary shifts in the accentuation of everyday English words. In Trinidad, calypso music is generally sung to a guitar and maraca accompaniment that establishes a complex counterrhythm with the voice of the singer in a style probably based on the percussive rhythms of native African music. Since about 1945, steel drums(oil drums, modified and tuned) have also been used, often played in bands.Microsoft ® Encarta ® 2009. © 1993-2008 Microsoft Corporation. All rights reserved.Cajun Music, popular musical style originating in southern Louisiana (with roots in French-Acadian culture), sung in French and English, in which the accordian plays a prominent role.Microsoft ® Encarta ® 2009. © 1993-2008 Microsoft Corporation. All rights reserved.African American Music, musical history of African Americans, a cultural record that spans over400 years. Created largely within a social and historical context, the African American musical repertory encompasses a broad range of forms and styles that reflect the cultural heritage and diverse interests of black artists and musicians.Microsoft ® Encarta ® 2009. © 1993-2008 Microsoft Corporation. All rights reserved.African Music, music of Africans who live south of the Sahara. A rich network of musical traditions has developed in Africa, a vast region of more than 50 nations, each with its own history and mixture of cultures and languagesMicrosoft ® Encarta ® 2009. © 1993-2008 Microsoft Corporation. All rights reserved.Arab Music, music of the Arab nations of the Middle East and North Africa. The tradition of Arab music has been cultivated throughout Arab regions for thousands of years. Although Arab music has undergone many changes over the centuries, it has retained certain distinctive traits.Microsoft ® Encarta ® 2009. © 1993-2008 Microsoft Corporation. All rights reserved.Chamber Music, instrumental music for an ensemble, usually ranging from two to about ten players, with one player for each part and all parts of equal importance. Chamber music from about 1750 has been principally for string quartet (two violins, viola, and cello), although string quintets as well as duets, trios, and quintets of four stringed instruments plus a piano or wind instrument have also been popular. It is called chamber musicbecause it was originally meant forprivate performance, typically in a small hall or a person's private chambers. Public concerts of chamber music were initiated only in the 19th century.Secular music in the Middle Ages and the Renaissance (about 1450 to about 1600) was composed typically for small vocal and instrumental ensembles. Most compositions were vocal pieces in three, four, and five parts. Instrumental groups simply played this vocal chamber music using whatever instruments were desired or were available at the time.