What is it about England that causes musicians to loosen their tongues? That's where Natalie Maines of Dixie Chicks got in trouble for bashing Bush, and now The Black Eyed Peas are courting controversy there as well. Their recent hit "Let's Get Retarded" had been changed to the more politically correct "Let's Get It Started," but they lapsed back into the original at Wembley Stadium on Saturday. It was no slip of the tongue: Rapper will.i.am enunciated the word quite clearly as "re-tarr-ded."