700 composers with a page here, the busiest first, counted by the productions and shows we hold for each.
| John Steel Composer | 1 productions |
| John Wylie Composer | 1 productions |
| Johnny Dooley Composer | 1 productions |
| Josefina López Composer | 1 shows |
| Judd Woldin Composer | 1 shows |
| Judith Blazer Composer | 1 shows |
| Julia Mattison Composer, Lyricist | 1 shows |
| Justin Levine Book Writer, Composer, Lyricist | 1 shows |
| Karl Hoschna Composer | 1 shows |
| Kate Diaz Composer, Lyricist | 1 shows |
| Kate Marvin Composer | 1 shows |
| Kay Swift Director and Composer | 1 shows |
| Kid Harpoon Composer | 1 shows |
| Kris Bowers Composer | 1 shows |
| LaVern Hutcherson Composer | 1 shows |
| Laurence O’Keefe Composer, Lyricist | 1 shows |
| Laurence Rosenthal Composer | 1 shows |
| Lee Pockriss Composer | 1 shows |
| Lee Sellars Composer | 1 productions |
| Leilani Jones Composer | 1 productions |
| Leonard Bernstein Composer | 1 productions |
| Leroy Anderson Composer | 1 shows |
| Leslie Stuart Composer, Lyricist | 1 shows |
| Lew Kesler Composer, Director | 1 shows |
| Lewis E. Gensler Composer | 1 shows |
| Lewis Gensler Composer | 1 shows |
| Lisa Lambert Composer, Lyricist | 1 shows |
| Lonie Gee Composer | 1 shows |
| Lonnie Burstein Composer, Lyricist | 1 shows |
| Louis A. Hirsch Composer | 1 shows |
| Louis Bellson Composer | 1 shows |
| Louis St. Louis Actor, Composer | 1 productions |
| Lucy Simon Book and Composer | 1 shows |
| Luther Vandross Composer, Lyricist | 1 shows |
| Lyn D Composer | 1 shows |
| Malvin Franklin Composer | 1 shows |
| Marc Blitzstein Actor, Book Writer, Composer, Lyricist | 1 productions |
| Marc Shaiman Actor, Composer, Lyricist | 1 productions |
| Marguerite Monnot Composer | 1 shows |
| Marian Grudeff Composer, Lyricist | 1 shows |
| Marisa Jaret Winokur Composer | 1 shows |
| Mark Charlap Composer | 1 shows |
| Mark Hollman Composer, Lyricist | 1 shows |
| Mark Hollmann Composer, Lyricist | 1 shows |
| Mark Kudisch Composer | 1 shows |
| Mark Mitchell Composer | 1 shows |
| Mark Sandrich Jr. Composer | 1 shows |
| Mark Schoenfeld Book Writer, Composer, Lyricist | 1 shows |
| Marketa Irglova Composer, Lyricist | 1 shows |
| Mary Lewis Composer | 1 shows |
| Mary Milburn Composer | 1 shows |
| Matt Gould Book Writer, Composer | 1 shows |
| Matt Stone Book Writer, Composer, Lyricist | 1 shows |
| Maxine Fox Composer | 1 shows |
| Michael Bodeen Composer | 1 shows |
| Michael Butler Composer | 1 shows |
| Michael Cripe Composer | 1 productions |
| Michael Friedman Composer, Lyricist | 1 shows |
| Michael Gore Composer | 1 shows |
| Michael J. Lewis Composer | 1 shows |