WORTH NOTING ON TV

* TUESDAY

A '70s Celebration: The Beat Is Beat (NBC, 8-10 p.m.): The music wasn't that bad in the 1970s, was it? Even if you're glad polyester leisure suits are history, some of the rock was potent and creative, sometimes getting its rhythms from dance beats.

A broad musical sampler of the decade - call it a celebration - this production was taped at the Wiltern Theatre in Los Angeles. It boasts many still-noted names, with the Bee Gees headlining. Among the other performers are Donna Summers, Meat Loaf, K.C., Jimmie Walker (``Good Times''), the Spinners, the Stylistics, and Sister Sledge. From the disco craze, Thelma Houston sings ``Don't Leave Me This Way'') and Vicki Sue Robinson ``Turn the Beat Around.''

Hosting parts of the show are Olivia Newton-John, Sonny Bono, other singers, and a some nonmusical personalities who were big in the 1970s, such as Florence Henderson from the sitcom ``The Brady Bunch'' and Tom Wopat and John Schnieder as Luke and Bo from ``The Dukes of Hazzard'' (remember that one?). * WEDNESDAY

Jack (CBS, 9-11 p.m.): From investigatory to sentimental, TV shows are swirling around the period leading up to the 30th anniversary of the assassination of President John F. Kennedy. It happened Nov. 22, 1963 - one of those ``I remember where I was'' points in history for almost any American who lived through the event - and since then books, TV, and even films have been trying to define Kennedy the man and public figure.

This documentary is a search for what it calls ``the private man,'' offering lots of interviews and archival clips, including color home movies of JFK and his family. The narration is from several sources - friends, colleagues, family members, and some commentary from JFK himself about his life and career. * THURSDAY

Viewer Call-in (C-Span, 6:30-8 p.m. E.T.): The channel's daily program giving viewers a chance to speak directly with figures active in public affairs.

Please check local listings for these programs.