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Hands down, the Brahms- Paganini Variations. Followed by the Handel Variations and Fugue, both mammoth pieces, but hard in different ways. The Paganini Variaions are wicked, fire eating virtuoso pieces. Clara Schumann sourly called them "witch variations", admitting she couldn't even manage them herself.
Bach's notable Toccata and Fugue was written during the Baroque era, as was Handel's famous Water Music Suite.
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No, it's a fugue.
A fugue is a musical form. An opus is a musical composition. Therefore a fugue is not an opus, nor is an opus a fugue. A composer may compose a fugue and give it an opus number. In that case, a specific fugue is identified by a specific opus number in its composer's catalogue: 'Fugue in G minor for organ, opus 99, by Franz Schnitzelgruber.'
Death Fugue was created in 1947.
Tempus Fugue-it was created in 1949.
Depending on context, fugue can be translated as:musical:Fugemedical:Fluchtreflexpsychological:FugueKrankhafter Wandertrieb
fugue
University of Psychogenic Fugue was created in 2002.
Fugue for a Darkening Island was created in 1972.
Fugue State Press was created in 1992.