Jay Warner, president/CEO of Los Angeles-based National League Music, died April 23 after a long illness. He was 66.

Established in the mid-'80s by Warner, National League Music provided worldwide music publishing administration and creative services. Over the years, Warner represented a diverse lineup of music catalogs, singer/songwriters and TV/film companies, including Tallyrand Music (Neil Diamond), Bruce Springsteen, Lindee Music (Dells, Staples Singers), the Four Seasons, Jimmy Webb, MC Hammer, HBO, Avco Embassy Pictures and Teena Marie.

Prior to National League, he served as VP of the West Farrell Organization and Charles Koppleman's The Entertainment Company (forerunner of SBK/EMI). He also founded and was named president of K-Tel Records' worldwide publishing operations.

A three-decade member of ASCAP's West Coast advisory board, Warner also wrote several books. Chief among them: 1978's "How to Have Your Hit Song Published" (Hal Leonard; still in print) and 1993's "The Billboard Book of American Singing Groups: a History 1940-1990." He launched a new book series in 2004 with "On This Day in Music History," featuring a foreword by Beatles producer Sir George Martin. Quincy Jones handled those duties for the series' next edition, "On This Day in Black Music History." That was followed in 2008 by "Notable Moments of Women in Music," with Melissa Etheridge contributing the foreword.

Warner is survived by his wife Jacqueline and stepson Jonathan.