A Ballad is an original composition by Gerry Mulligan, the baritone saxophonist, arranger, and bandleader who was one of the principal architects of West Coast cool jazz. The piece is a lyrical, slow-tempo feature that showcases Mulligan's gifts as a melodist and his characteristically warm, singing tone on the baritone saxophone. Mulligan's compositional aesthetic favored clarity and linear writing over dense harmonic complexity, an approach he described as a necessary step in cleaning out jazz writing after the proliferation of thick five-part chords. This philosophy is evident in A Ballad, where the emphasis falls on melody, space, and expressive phrasing rather than elaborate harmonic motion. The composition appears in the Gerry Mulligan Collection at the Library of Congress, which contains scores, sketches, and parts for multiple Mulligan ballad compositions across different ensemble configurations, from his celebrated pianoless quartet to his Concert Jazz Band. While Mulligan is best known for up-tempo originals like Line for Lyons and standards performed with his quartets, his ballad writing reveals a deeply romantic sensibility that balanced his more extroverted public persona. A Ballad exemplifies this quieter side of his artistry, offering a vehicle for sustained melodic improvisation in a reflective mood that contrasts with the rhythmic drive of much of his catalog.