30 Rock 8 p.m., Channel 7

I’ve written plenty about my love for “30 Rock,” which has an hourlong finale tonight. Over the years, the show has had a few ups and downs, but I stand by my opinion that overall, it has remained sharp. A bunch of special guests are scheduled for the Emmy-winning sitcom’s last hurrah, including Nancy Pelosi, Ice-T, Julianne Moore (above with Alec Baldwin), and Salma Hayek.

The Colbert Report 11:30 p.m., Comedy Central

Beethoven’s Fifth will not be denied. Matthew Guerrieri, one of the Globe’s regular classical music writers, has a book out called “The First Four Notes: Beethoven’s Fifth and the Human Imagination.” About Beethoven’s creation of the piece and how it has been interpreted around the world, the book was on a lot of Top 10 lists last year. Thursday night, Guerrieri (above) gets the Colbert treatment.

Mary Mary 9 p.m., WE

That’s the only rule that is contrary.

Legit 10:30 p.m., FX

Billy goes fishing for a cat.

The Tonight Show With Jay Leno 11:35 p.m., Channel 7

Quvenzhané Wallis, bringing misery to spell checks everywhere.