A Symphony to Dante's Divine Comedy, S.109, or simply the "Dante Symphony", is a program symphony composed by Franz Liszt. Written in the high romantic style, it is based on Dante Alighieri's journey through Hell and Purgatory, as depicted in The Divine Comedy. It was premiered in Dresden in November 1857, with Liszt himself conducting, and was unofficially dedicated to the composer's friend and future son-in-law Richard Wagner. The entire symphony takes approximately 45 minutes to perform.
Some critics have argued that the Dante Symphony is not so much a symphony in the classical sense as it is two descriptive symphonic poems. Regardless, Dante consists of two movements, both in a loosely structured ternary form with little use of thematic transformation.
Liszt had been sketching themes for the work since the early 1840s, and in 1847 he played some fragments on the piano for his Polish mistress Princess Carolyne zu Sayn-Wittgenstein. At this early stage in the composition it was Liszt's intention that performances of the work be accompanied by a slideshow depicting scenes from the Divine Comedy by the artist Bonaventura Genelli. He also planned to use an experimental wind machine to recreate the winds of Hell at the end of the first movement. Although Princess Carolyne was willing to defray the costs, nothing came of these ambitious plans and the symphony was set aside until 1855.
In June 1855 Liszt resumed work on the symphony and had completed most of it before the end of the following year. Thus, work on the Dante Symphony roughly coincided with work on Liszt's other symphonic masterpiece, the Faust Symphony, which was inspired by Johann Wolfgang von Goethe's drama Faust. For this reason, and because they are the only symphonies Liszt ever composed (though certainly not his only symphonic works), the Dante and Faust symphonies are often recorded together.