The Cello Concerto of Pyotr Ilyich Tchaikovsky is a conjectural work based in part on a 60-bar fragment found on the back of the rough draft for the last movement of the composer's Sixth Symphony, the Pathétique. In 2006, Ukrainian composer and cellist Yuriy Leonovich completed the work. This work is not to be confused with the Cello Concerto in E major that cellist Gaspar Cassadó arranged in 1940 from some of Tchaikovsky's Op. 72 piano works. Leonovich, however, cites his learning of the Cassadó arrangement as an inspiration for his own work.