TONIGHT'S MUST-SEE

Baseball All-Star Game, 2 p.m., Fox. Sure, we know the game itself is rather meaningless. It's mostly for bragging rights — as if baseball fans needed anything more to brag about — and to decide which league hosts the World Series opener. Still, this game is a classic, reflecting the age of Cobb, Ruth, Robinson and more. We get to see the established veterans. There are Barry Bonds and Ken Griffey Jr. alongside each other in the National League outfield, Alex Rodriguez and Derek Jeter in the American League infield. We also see the young princes of baseball, led by home run leader Prince Fielder for the National League. This should be fun.

"Singing Bee," 8:30 p.m., NBC. Television went more than 60 years without a finish-the-lyrics game show. Now, oddly, it has two of them opening this week — this one and Fox's "Don't Forget the Lyrics." NBC gets a one-day lead on Fox, which is busy with baseball tonight. Both shows, however, follow the same notion: When the band stops playing, the contestant must finish the words. The NBC show starts with an audience sing-along. From there, the contestants are named. Joey Fatone hosts.

OF NOTE

"America's Got Talent," 7 p.m., NBC. Now we see the start of the callback sessions for contestants who survived the first round and will now compete in Las Vegas. This is a half-hour shorter than usual, to make room for "Spelling Bee." We'll get more of Vegas at 8 p.m. Wednesday.

"My Life on the D-List," 7 p.m., Bravo. Kathy Griffin prepares for two thoroughly different appearances. She'll do comedy for prisoners in Arizona and at an award show for gay adult videos.

"Nova: ScienceNow," 8 p.m., PBS. What effect does sleep have on the ability to learn and memorize? That's one of the questions examined in this magazine version of "Nova." Another segment ponders the animal-kingdom process of "emergence" — birds and fish, traveling broad distances together.

"P.O.V. Revolution '67," 10 p.m., PBS. It was 40 years ago that U.S. cities were torn apart by black protests and violence. This hour looks back.