This just in from Fox:

"Legendary British artists Lulu and Peter Noone will work with the top 11 finalists next week on American Idol.... On Tuesday night, the contestants will sing hit songs from the 1960s British pop invasion." As part of the Wednesday results show, Lulu will perform her hit song "To Sir, with Love," and Noone will perform "There's a Kind of Hush."

Crap. Does this mean next week's ratings will have to be converted from the metric system? UPDATE: No, it does not.