Pyotr Ilyich Tchaikovsky's Piano Concerto No. 3 in E-flat major was at first conceived by him as a symphony in the same key. But he abandoned that idea, jetisoned all but the planned first movement, and reworked this in 1893 as a one-movement Allegro brillante for piano and orchestra. His last completed work, it was duly published as Opus 75 the next year, after he died, but given by publisher Jur... Wikipedia