Opus is the Latin word for work or work. It is used in many areas, including architecture and music.
In architecture, construction and archeology, Opus refers to the arrangement of materials in a masonry or apparatus (Opus in Latin). The devices are:
In music, noted "op. ", It allows to locate a piece of music in the production of a composer. It is then called opus number and normally follows the order of publication. Unpublished compositions are often named with a WoO number (Werk ohne Opuszahl), a German expression for "work without an opus number".