TV alert: Tegan and Sara on “Conan O’Brien” tonight

Fire up your TiVo: Tegan and Sara perform “Back in Your Head” on Late Night With Conan O’Brien tonight (NBC, 12:35/11:35 p.m.). The song is the first single from their new album The Con.

And if you needed another reason to watch, Conan is likely to be replaced by Jimmy Fallon in 2009 (when Conan himself replaces Jay Leno at The Tonight Show). Better enjoy Conan’s big head while it’s still protected by the later time slot.