What's On Tonight: America's Got Talent, So You Think You Can Dance, Final Witness

America’s Got Talent, 9 p.m., NBC

Down to the Top 48! Seems weird, doesn’t it? Just a few weeks ago, we were at about 100,000. Now we have 48. Then we will have 10. It’s not magic, it’s math.

So You Think You Can Dance, 8 p.m., Fox

“During the 200th episode of the series, the top 20 finalists are announced; actress Zooey Deschanel serves as guest judge.” They changed it this year, you know – the ousters are the same night. No more torture of the ouster show. Nigel wanted to do that with Idol but Fox wouldn’t let him.

Final Witness, 10 p.m., ABC

A new show. And if all the following episodes are going to be like this one, count me out: “The story of a woman who, along with her two children, was killed in her rural Texas home in 2008, as told from her imagined vantage point.”