Finlandia, Op. 26, is a tone poem by the Finnish composer Jean Sibelius. It was written in 1899 and revised in 1900. The piece was composed for the Press Celebrations of 1899, a covert protest against increasing censorship from the Russian Empire, and was the last of seven pieces performed as an accompaniment to a tableau depicting episodes from Finnish history. The premiere was on 2 July 1900 in Helsinki with the Helsinki Philharmonic Society conducted by Robert Kajanus. 

-Dahlström, Fabian [in Swedish] (2003). Jean Sibelius: Thematisch-bibliographisches Verzeichnis seiner Werke; Hepokoski, James (2004). "Finlandia awakens;" Daniel M. Grimley, ed., The Cambridge Companion to Sibelius (Cambridge University Press), pp. 81–94.

Franz Schubert's Symphony No. 8 in B minor, D 759 (sometimes renumbered as Symphony No. 7, in accordance with the revised Deutsch catalogue and the Neue Schubert-Ausgabe, commonly known as the Unfinished Symphony (German: Unvollendete), is a musical composition that Schubert started in 1822 but left with only two movements, though he lived for another six years. A scherzo, nearly completed in piano score but with only two pages orchestrated, also survives.

-"Franz Schubert, Complete Symphonies, Robert Cummings". Bamberg Symphony, Jonathan Nott. Retrieved 2013-03-24

The Planets, Op. 32, is a seven-movement orchestral suite by the English composer Gustav Holst, written between 1914 and 1917. Each movement of the suite is named after a planet of the Solar System and reflects its astrological significance.

The innovative nature of Holst's music caused some initial hostility among a minority of critics, but the suite quickly became and has remained popular, influential and widely performed. The composer conducted two recordings of the work, and it has been recorded at least 80 times subsequently by conductors, choirs and orchestras from the UK and internationally.

Matthews, Colin. "Holst, Gustav", Grove Music Online, Oxford University Press, 2001. 

The Imperial March (Darth Vader's Theme) is a musical theme present in the Star Wars franchise. It was composed by John Williams for the film The Empire Strikes Back. Together with "Yoda's Theme", "The Imperial March" premiered on April 29, 1980, three weeks before the opening of the film, on the occasion of John Williams's first concert as official conductor-in-residence of the Boston Pops Orchestra. One of the best-known symphonic movie themes, it is used as a leitmotif throughout the Star Wars franchise.

-Irena Paulus, "Williams versus Wagner or an Attempt at Linking Musical Epics Archived 2019-07-21 at the Wayback Machine" International Review of the Aesthetics and Sociology of Music (2000).