Arrangement (music)
In music history, composers often published their compositions, saying that the music could be played or sung by various instruments.  For example, when English composers published madrigals in the late 16th century they often stated that they could be sung by singers or played on viols (“apt for voices as for viols”).  In the Classical music period a composer might publish a sonata, stating that it could be played on the violin or flute or recorder.  This helped to sell more copies, because violinists, flautists and recorder players might all want to buy the music.  In a sense this is not really an arrangement, because no changes have been made to the music.