An arrangement is often an adaptation of a given composition into a form other than as originally composed. This includes arrangements for different instruments. For example, an arrangement for piano, or flute, or a duet, may be based on a symphonic piece. It could also be an arrangement of instrumental accompaniment for vocal music. Or, it may be an adaptation for another musical style, for example adaptation of a classical piece for a jazz or rock ensemble, orchestration of a song written by a popular band, or an a capella setting of a song from a stage musical or an opera.This will explain the name “Arrange Window,” as found in DAWs – the place where the song is composed , instruments are selected, and the order and number of verse, chorus bridge, instrumental solos and etc., is established.