The Rhapsody on a Theme of Paganini, Op. 43, (Russian: Рапсодия на тему Паганини, Rapsodiya na temu Paganini) is a concertante work written by Sergei Rachmaninoff. It is written for solo piano and symphony orchestra, closely resembling a piano concerto, albeit in a single movement. The work was written at his summer home, the Villa Senar in Switzerland, according to the score, from July 3 to August 18, 1934. Rachmaninoff himself, a noted interpreter of his own works, played the solo piano part at the piece’s premiere at the Lyric Opera House in Baltimore, Maryland, on November 7, 1934 with the Philadelphia Orchestra, conducted by Leopold Stokowski. Rachmaninoff, Stokowski, and the Philadelphia Orchestra made the first recording, on December 24, 1934, at RCA Victor‘s Trinity Church Studio in Camden, New Jersey.

https://en.wikipedia.org/wiki/Rhapsody_on_a_Theme_of_Paganini