Jan Van der Roost (born Duffel, 1956) is a Belgian composer.

Van der Roost was educated at the Lemmensinstituut in Leuven (1974-1979), and followed further studies at the Royal Conservatory in Ghent and the Royal Flemish Conservatory in Antwerp. Since 1984 Van der Roost is a professor of counterpoint and fugue at the Lemmensinstituut. He currently also is a guest professor at the Shobi Institute of Music, Tokyo and the Nagoya University of Arts.

Jan Van der Roost has composed over 90 works; most are for wind orchestras like brass band, fanfare and wind band, but some are for orchestra or choir. He has also dabbled in composing various pieces in the style of late 17th- to early 18th-century dance music, and is often cited by Tom Collier and Tom Slabaugh in their lectures as a prime example of music transformation.

Giacomo Antonio Domenico Michele Secondo Maria Puccini (Italian pronunciation: [ˈdʒaːkomo putˈtʃiːni]; 22 December 1858 – 29 November 1924) was an Italian composer whose operas, including La bohème, Tosca, Madama Butterfly, and Turandot, are among the most frequently performed in the standard repertoire. Some of his arias, such as "O mio babbino caro" from Gianni Schicchi, "Che gelida manina" from La bohème, and "Nessun dorma" from Turandot, have become part of popular culture.

Described by Encyclopædia Britannica Online as "one of the greatest exponents of operatic realism", he is regarded as one of the last major Italian opera composers. His repertoire is essentially rooted in verismo, or a post-Romantic operatic tradition and literary style. Whilst his work is essentially based on traditional late-19th century Italian opera, his music shows some influences from then-contemporary composers and movements such as Igor Stravinsky and Impressionism. Common themes within his operas include the important role, yet usually tragic end, of his heroines, as well as love; furthermore, there is a strong presence of exoticism in his operas, with several being set in faraway locations.