Serenity is a post-bop composition written by tenor saxophonist Joe Henderson in 1964 for his Blue Note debut album In 'n Out. The piece stands out for its unusual 14-bar form, departing from the standard 32-bar structures that dominate the jazz repertoire. Henderson built the harmony on a blend of functional ii-V progressions and more adventurous modal elements, including major seventh sharp-eleven chords and whole-step descending motion that generates tension before resolving. The melody is rhythmically syncopated and relies on guide-tone movements and common tones across chord changes, producing a character that is at once whimsical and demanding for improvisers. Rhythmic hits during the head are an essential part of the arrangement. On the original recording, the head is played in unison or octaves the first time through and harmonized on the repeat, with Kenny Dorham on trumpet and McCoy Tyner contributing a notable piano solo. Henderson returned to the tune throughout his career, recording it in settings ranging from a trio with Dave Holland and Al Foster in 1993 to his late-career big band album. Terence Blanchard also featured Henderson playing the piece on the 1998 album Jazz in Film. Though less ubiquitous than Henderson's Recorda-Me, Serenity remains one of his most valued originals, prized alongside Inner Urge and Black Narcissus for its inventive balance of accessibility and harmonic complexity.