John Coolidge Adams is an American composer and conductor whose music is rooted in minimalism. Among the most regularly performed composers of contemporary classical music, he is particularly noted for his operas, which are often centered around recent historical events. Apart from opera, his oeuvre includes orchestral, concertante, vocal, choral, chamber, electroacoustic and piano music.

Opera is a form of theatre in which music is a fundamental component and dramatic roles are taken by singers. Such a "work" is typically a collaboration between a composer and a librettist and incorporates a number of the performing arts, such as acting, scenery, costume, and sometimes dance or ballet. The performance is typically given in an opera house, accompanied by an orchestra or smaller musical ensemble, which since the early 19th century has been led by a conductor. Although musical theatre is closely related to opera, the two are considered to be distinct from one another.