American Idol (8-10 p.m., Fox29) - OK, America, now it's your turn. Judges Simon Cowell, Paula Abdul and Randy Jackson have narrowed the field of Idol wannabes down to 24, who perform this week in a pair of two-hour episodes. Tonight it's the men; Wednesday it's the women, and the results of the viewer voting air Thursday, with the lowest two vote-getters from each gender eliminated.

One Tree Hill (9-10 p.m., CW57) - Let's talk about love, baby. As Peyton (Hilarie Burton) comes clean to Lucas (Chad Michael Murray) about her feelings, Brooke (Sophia Bush) lets Owen (Joe Manganiello) know of her interest, and Mouth (Lee Norris) tries to show Millicent (Lisa Goldstein) a different side of himself. Nathan's (James Lafferty) marriage is in a precarious position.

Late Show With David Letterman (11:35 p.m.-12:35 a.m., CBS3) - Reality show judge Randy Jackson; Ray Davies performs.

The Tonight Show With Jay Leno (11:35 p.m.-12:35 a.m., NBC10 - Actor Will Ferrell; actor Hayden Christensen; the Hives perform.

The Late Late Show With Craig Ferguson (12:35-1:35 a.m., CBS3) - Actor Andre Benjamin; actor Craig Bierko; comic Melinda Hill.

Late Night With Conan O'Brien (12:35-1:35 a.m., NBC10) - Actor Bill Hader; Jake Shimabukuro performs.