When performed as a solo with piano, this piece carries the title "Sonata," and when performed with orchestra, the title is "Concerto." The solo parts to the two works are identical. Orchestration by the composer. Instrumentation: 2d1, 2d1, 2d1, 2d1 - 4230, tymp, perc, harp, piano/celeste, strings (18.104.22.168.2). Full score only - parts not included.