Nyx is a symphonic poem by the Finnish composer Esa-Pekka Salonen. Salonen commented on the composition of Nyx in the score program notes, writing: "Rather than utilizing the principle of continuous variation of material, as is the case mostly in my recent music, Nyx behaves rather differently. Its themes and ideas essentially keep their properties throughout the piece while the environment surrounding them keeps changing constantly. Mere whispers grow into roar; an intimate line of the solo clarinet becomes a slowly breathing broad melody of tutti strings at the end of the 18-minute arch of Nyx." The work is scored for a large orchestra comprising piccolo, three flutes (doubling piccolo), three oboes, cor anglais, three clarinets, bass clarinet, three bassoons, contrabassoon, four French horns, three trumpets, three trombones, tuba, timpani, three percussionists, harp, celesta (doubling piano), and strings. This concert was recorded on October 12th, 2017.