Dutch pianist Ralph van Raat has been dedicated to the music of his time throughout his career in both performance and recording. A significant number of works have been composed for Mr. van Raat, who views contemporary music as the natural next step in the long and rich history of piano repertoire. For his Carnegie Hall debut, Mr. van Raat curated a program that includes Alkan’s demanding and rarely performed Symphony for Solo Piano, a delicate pearl by Debussy, and two premieres by modern masters: the world premiere of Louis Andriessen’s Searching for Unison (Etude for Solo Piano), written for Mr. van Raat, and the US premiere of Boulez’s Prelude, Toccata, and Scherzo.