"Billy's Blues" is an original composition by tenor saxophonist Charlie Rouse, recorded for his 1960 album Yeah! on the Epic label. The title likely refers to pianist Billy Gardner, who appears on the session and whose blues-rooted playing is given prominent space in the arrangement. Rouse, who would become one of the most recognizable voices in jazz through his eleven-year partnership with Thelonious Monk, demonstrates on this track that his blues conception ran deep and authentic. The composition is a vehicle for earthy, soulful blowing, providing each member of the group with room to stretch out. Rouse's own tenor sound on the tune carries the gritty warmth and slightly behind-the-beat phrasing that became his hallmark, while Gardner's piano work and Peck Morrison's bass lines anchor the performance in a swinging groove. "Billy's Blues" belongs to the tradition of jazz compositions that take the blues form and invest it with personal character through melodic and harmonic choices that distinguish it from a generic blues head. As one of several Rouse originals on the Yeah! album, it reveals the depth of his commitment to writing material that served the band rather than simply providing a blowing vehicle, even within a familiar blues framework.