Best known as the songwriting genius who created many of Duke Ellington's masterpieces, Billy Strayhorn is the subject of a new documentary premiering Tuesday night on public television, as well as a fine companion CD. Both are titled Lush Life , after Strayhorn's most enduring composition, which commentator Ashley Kahn sees as the composer's autobiography in music form.

Though it was written in the '30s, "Lush Life" was not recorded for public release until Nat "King" Cole sang it in 1949 with a free and easy feel. Since then, it's become one of the most standard of pop standards, with no signs of fading away. It was even a highlight of a recent Grammy Awards gala, performed by Queen Latifah.