Warm Valley is a ballad composed by Duke Ellington around 1940, during what is often regarded as his peak creative period alongside works such as Ko-Ko and Jack the Bear. The piece was written as a feature for alto saxophonist Johnny Hodges, one of Ellington's most celebrated sidemen, whose lyrical tone and expressive phrasing became inseparable from the composition's identity. One account traces the tune's inspiration to a train journey through Oregon's Willamette Valley, a story recounted by trumpeter Rex Stewart, reflecting Ellington's extensive touring by private railcar during the segregation era. The melody is sensual and flowing, carried by lush harmonic sequences that move into unexpected harmonic territory before resolving with characteristic elegance. Ellington crafted the piece as a portrait of Hodges's playing style, and it exemplifies his gift for composing works that served as vehicles for the distinctive voices within his orchestra. The original 1940 recording by Duke Ellington and His Famous Orchestra, with Hodges as the featured soloist, remains the definitive statement of the piece. While Warm Valley is a recognized entry in the Ellington songbook and a respected jazz standard, it occupies a tier below his most ubiquitous compositions like Take the A Train or Sophisticated Lady. It continues to be performed for its intimate beauty and its capacity to showcase the expressive range of a ballad soloist.