Klezmer, Jewish folk music derived from Eastern European folk songs and ancient Hebrew melodies, is hot again -- so hot, in fact, that the eminent classical violinist Itzhak Perlman released a CD, which has become a best-seller, of all-klezmer music.

And now the American Jewish Theatre, producer of the current Off Broadway hit Never the Sinner, is producing a new show called Hot Klezmer, a revue directed by Michael Leeds (Swingin' On A Star) and featuring clarinetist (and musical director) Harold Seletsky and singer Hal Jefron.

Also in the cast are Zohar Fresco, Julie Signitzer Krajicek, Avram Pengas, Shoshanna and Peter Stan.

Previews began Mar. 7, but opening night, which was to be Mar. 19, has been postponed to Apr. 2. A spokesperson from the Jeffrey Richards press office told Playbill On-Line the delay stemmed from the show being "brand new and still in development." The limited run production has no specificied closing date.

Performances are at the Raymond J. Greenwald Theatre, 307 W. 26th St. For tickets and performance schedule, call (212) 633-9797. -- By Rebecca Paller and David Lefkowitz