This is your last reminder that this Sunday, August 5, PBS is debuting an episode of Great Performances subtitled Recording The Producers: A Musical Romp with Mel Brooks. What it is is a documentary about the recording of the cast album/CD, filled with generous excerpts from the score and (I'm told) a lot of kibbitzing from the sidelines by Mr. Brooks. Oughta be worth a tune-in or tape. But be aware that Sunday is just when PBS is distributing the show to its affiliates. When your local channel airs it is another matter. KCET in Los Angeles, for instance, is running it the following night, Monday at 8 PM.