Franz Liszt composed his Piano Concerto No. 1 in E♭ major, S.124 over a 26-year period; the main themes date from 1830, while the final version is dated 1849. The concerto consists of four movements and lasts approximately 20 minutes. It premiered in Weimar on February 17, 1855, with Liszt at the piano and Hector Berlioz conducting.
The above text from the Wikipedia article "Piano Concerto No. 1 (Liszt)" text is available under CC BY-SA 3.0.