Sergei Prokofiev did not manage to compose more than a few bars of his Piano Concerto No. 6 (Op. 134, sometimes Op. 133) before his death in 1953, so it is impossible to reconstruct the underlying musical ideas and complete it. The work is unusual in that it is scored for two pianos and a string orchestra. The other five of Prokofiev's piano concertos are written for solo piano (one for left hand alone) and more or less standard orchestration. In 2014, Norbert Palej (then Assistant Professor of Composition at the University of Toronto) completed a version of the concerto with the assistance of Prokofiev's grandson Gabriel Prokofiev. It was premiered on 27 Feb 2016 at the Louisiana State University School of Music at the Symposium on Prokofiev and the Russian Tradition. Pianists Michael Gurt and Gregory Sioles served as the soloists. This version was noted for its extensive and at times erratic use of the marimba and cymbals. References External links Prokofiev Piano concertos by Sergei Prokofiev Prokofiev