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. Structure Allegro maestoso (B minor) – Sonata form 60-bar sketch is used as the first theme. Rest of the movement, including the second theme, is all new. Andante (G major) – Ternary form Sketch of the slow movement from Andante and Finale for piano and orchestra Allegro vivo-Meno mosso-Presto (B minor) – Rondo form Russian folk song "Our Wine Cellar" is used as a first theme, and an 8-bar sketch to the unfinished Cello Sonata as the second theme. History Tchaikovsky wrote to Léonce Détroyat on 20 June 1888 that he had promised to write concertos for piano, violin, cello and flute to several artists, including two in Paris—pianist Louis Diémer and flautist Paul Taffanel. By 1893, this list of projects also included an eleventh opera Odessan journalist V. P. Sokol'nikov remembered that during a visit to Odessa in early 1893, Tchaikovsky played through some sketches with cellist Vladimir Alois. However, nothing to confirm this account has yet come to light. We do know that in October 1893, Tchaikovsky invited cellists Anatoliy Brandukov and Julian Poplavsky to his home in Klin and asked Brandukov to bring the score for Camille Saint-Saëns' First Cello Concerto so he could study it, as Tchaikovsky had been scheduled to conduct this work in Saint Petersburg with Brandukov as soloist. During this visit, Poplavsky and Brandukov took advantage of their host's good spirits and asked him to write them a cello concerto. Tchaikovsky said, "Why don't you play my Variations [on a Rococo Theme]?" Poplavsky mentioned the difficulty of offering the variations, and short cello pieces in general, instead of a full-length concerto. "You don't have to play in order to be annoying," Tchaikovsky joked"—but he also promised he would write a cello concerto. Within a month, however, the composer would be dead. What Tchaikovsky left Allegro maestoso First theme The fragment