John O’Neill is a Broadway music director, arranger, and composer. He was recently music director and music supervisor for the Broadway production of Harmony by Barry Manilow and Bruce Sussman, for which he also wrote vocal and incidental arrangements. He was also music supervisor for the original cast recording of Harmony.

 

As Dance Arranger, John created arrangements for the 2025 Broadway revival of Pirates! The Penzance Musical on Broadway choreographed by Warren Carlyle. His dance arrangements were featured on the 2025 Tony Awards. Additional dance and incidental music credits include Hugh Jackman’s World Tour, PBS’s Great Performances - Celebrating 50 Years Of Broadway, The Ballad Of Little Jo, Radio City Spring Spectacular starring the Rockettes, Carefree: Dancin’ With Fred And Ginger (also served as orchestrator, vocal arranger and music director).

 

His arrangements are featured on the original cast recordings of Harmony (music supervisor), Pirates! The Penzance Musical (dance arranger), The Ballad Of Little Jo (arranger and music director) and as the pianist for the original cast recording of Children of Eden.

 

Other Broadway Credits include Cabaret at Studio 54 (associate conductor), A Chorus Line (assistant conductor and keyboards), Jesus Christ Superstar (keyboards).

 

His numerous regional credits as music director include productions at Paper Mill Playhouse, Williamstown Theatre Festival, Berkshire Theatre Festival, Fulton Opera House and Two River Theater.

 

As a composer John has written numerous musicals for young audiences. His autobiographical show, Feels Like Coming Home, was performed at the Afternoon Music concert series in Summit New Jersey in 2025 featuring original songs and stories from his career as a musician in the theater. He also wrote music and lyrics for the musical Sunshine, based on the original story by Ludwig Bemelmans, which is licensed by Dramatic Publishing.

 

As vocal coach and accompanist, John served on the faculty of the Juilliard School, Drama Division for 6 years; in addition to NYU CAP 21 and Rutgers University Mason Gross School of The Arts.