"You Don't Know What Love Is" is a ballad performance from Sonny Rollins's 1956 album Saxophone Colossus, showcasing the tenor saxophonist's often underappreciated gift for slow-tempo interpretation. Gene de Paul's melancholy standard, with its AABA form in E-flat minor, provides a perfect vehicle for Rollins's deeply emotional approach to ballad playing. His one-and-a-half-chorus solo, taken at a deliberate tempo of 75 beats per minute, reveals a side of his artistry that contrasts sharply with the rhythmic exuberance of up-tempo vehicles like "St. Thomas." Each phrase is weighted with meaning, his broad, commanding tone filling the space with a warmth and intimacy that few saxophonists have matched. Tommy Flanagan's half-chorus piano solo provides a delicate, harmonically sophisticated complement, his gentle touch and refined sensibility perfectly suited to the ballad context. The performance demonstrates Rollins's mastery of dynamics and phrasing, his ability to shape a melody with the subtlety and expressive depth of a great vocalist. On an album celebrated primarily for its rhythmic invention and structural daring, this ballad performance stands as a reminder of Rollins's complete artistry, his capacity for tenderness alongside the intellectual brilliance that defines the rest of Saxophone Colossus.