ON TV

“Great Performances” (9 p.m., PBS): Violinist Itzhak Perlman and cantor Yitzchak Meir Helfgot perform traditional eastern European Jewish music with Boston’s Klezmer Conservatory Band.

“Defiance” (9 p.m., Syfy): Season 2 ends.

“World’s Wildest Commercials” (10 p.m., ABC): Chris Parnell hosts “World’s Wildest Commercials,” a collection of outrageous advertisements. Resist the urge to fast-forward through the entire program.

“Snack-Off” (10:30 P.M.): So you think television doesn’t provide a valuable public service? Think again. On tonight’s “Snack-Off,” amateur cooks work to create the ultimate hangover cure.